KENDRIYA VIDYALAYA SANGATHAN: HYDERABAD REGION

MODEL QUESTION PAPER -11 (2024-25)

CLASS: XII MAX.MARKS: 70

SUBJECT: CHEMISTRY (THEORY) DURATION: 3 Hours
General Instructions:
Read the following instructions carefully.
a) There are 33 questions in this question paper with internal choice.
b) SECTION A consists of 16 multiple-choice questions carrying 1 mark each.
c) SECTION B consists of 5 very short answer questions carrying 2 marks each.
d) SECTION C consists of 7 short answer questions carrying 3 marks each.
e) SECTION D consists of 2 case- based questions carrying 4 marks each.
f) SECTION E consists of 3 long answer questions carrying 5 marks each.
g) All questions are compulsory.
h) Use of log tables and calculators is not allowed
SECTION-A

The following questions are multiple -choice questions with one correct answer. Each question
carries 1 mark. There is no internal choice in this section.
1 For a reaction, the energy of activation is zero. The value of rate constant at [1]
300 K, if k = 1.6×106 s−1 at 280 K is:
(a) zero (b) 6.4×106 s−1
(c) 1.6×106 s−1 (d) 3.2×106 s−1

2 Which of the following is a non-reducing sugar? [1]

(a) Glucose (b) Sucrose (c) Maltose (d) Lactose

3 The atomic number of the element having magnetic moment equal to 1.7 [1]
BM in its +2 oxidation state is:
(a) 24 (b) 25 (c) 26 (d) 29

4 Solubility of gases in liquids decreases with rise in temperature because [1]

dissolution is an:
a)endothermic and reversible process
b)exothermic and reversible process
c)endothermic and irreversible process
d) exothermic and irreversible process

5 How many moles of AgCl will be precipitated when an excess of AgNO3 is [1]
added to a molar solution of [CrCl(H2O)5]Cl2?
(a) 6 moles (b) 8 moles (c) 3 moles (d) 2 moles
6 Arrange the following compounds in decreasing order of pKb values: [1]
C2H5NH2, (C2H5)2NH, C6H5NHCH3, C6H5NH2
a)C2H5NH2 > (C2H5)2NH > C6H5NH2 > C6H5NHCH3
b)C6H5NHCH3> C6H5NH2 > (C2H5)2NH > C2H5NH2
c)C6H5NH2 > C6H5NHCH3> C2H5NH2 > (C2H5)2NH
d)(C2H5)2NH >C2H5NH2 > C6H5NHCH3 > C6H5NH2
7 Which of the following shows structure of allylic alcohol? [1]
(i) CH2=CH-CH2OH(ii) CH2=CH-OH
(iii) CH2=CH-CH(CH3)-OH (iv) CH2=CH-C(CH3)2-OH
(a) (i), (iii) and (iv) (b) (i), (ii) and (iv)
(c) (ii), (iii) and (iv) (d) (i), (ii), (iii) and (iv)
8 Choose the correct IUPAC name for [1]

(a) 3-Bromo-2-methylpropene (b) 1-Bromo-2-methylbut-2-ene

(c) 4-Bromo-3-methylpent-2-ene (d) 3-Bromo-2-methylbut-1-ene
9 The variation of molar conductivity with concentration of an electrolyte (X) [1]
in aqueous solution is shown in the given figure

The electrolyte X is :
(a) HCl (b) NaCl
(c) KNO3 (d) CH3COOH

10 At 25°C, the molar conductance at infinite dilution for the strong [1]
electrolytes NaOH, NaCl and BaCl2 are 248 × 10–4, 126 × 10–4 and 280 ×
10–4 Sm2mol–1 respectively.
Λ0m Ba(OH)2 in S m2mol–1 is
(a) 52.4 × 10–4 (b) 524 × 10–4
(c) 402 × 10 (d) 262 × 10–4
–4

11 2-Bromopentane is heated with potassium ethoxide in ethanol. The major [1]

product obtained is
(a) 2-ethoxypentane (b) pentene-1
(c) cis-pent-2-ene (d) trans-pent-2-ene
12 Study the given reaction and identify the process which is carried out. [1]

a)It is used for purification of aldehydes and ketones

b)It is used to distinguish aldehydes from ketones
c)It is used to prepare cyclic aldehydes and ketones
d) It is used to study polar nature of aldehydes and ketones
13 Given below are two statements labelled as Assertion (A) and Reason (R) [1]
Assertion: Molarity of the solution changes with temperature.
Reason: Molarity is a colligative property.
Select the most appropriate answer from the options given below:
a)Both A and R are true and R is the correct explanation of A.
b)Both A and R are true but R is not the correct explanation of A.
c)A is true but R is false.
d)A is false but R is true.
14 Given below are two statements labelled as Assertion (A) and Reason (R) [1]
Assertion: Alkyl iodide can be prepared by treating alkyl chloride with
 NaI in acetone.
Reason: NaCl is soluble in acetone but NaI is not.
Select the most appropriate answer from the options given below:
a)Both A and R are true and R is the correct explanation of A.
b)Both A and R are true but R is not the correct explanation of A.
c)A is true but R is false.
d)A is false but R is true
15 Given below are two statements labelled as Assertion (A) and Reason (R) [1]
Assertion: Rate of reaction changes with temperature but rate constant
does not.
Reason: Rate of reaction depends upon concentration of reactants but
rate constant does not depend upon the concentration of
reactants.
Select the most appropriate answer from the options given below:
a)Both A and R are true and R is the correct explanation of A.
b)Both A and R are true but R is not the correct explanation of A.
c)A is true but R is false.
d)A is false but R is true.
16 Given below are two statements labelled as Assertion (A) and Reason (R) [1]
Assertion: Separation of Zr and Hf is difficult.
Reason: Because Zr and Hf lie in the same group of the periodic table.
Select the most appropriate answer from the options given below:
Both A and R are true and R is the correct explanation of A.
Both A and R are true but R is not the correct explanation of A.
A is true but R is false.
A is false but R is true.
SECTION B
This section contains 5 questions with internal choice in one question.
The following questions are very short answer type and carry 2
marks each.
17 A chloride of fourth group cation in qualitative analysis gives a green [2]
coloured complex [A] in aqueous solution which when treated with
ethane –1, 2 – diamine (en) gives pale - yellow solution [B] which on
subsequent addition of ethane –1, 2 – diamine turns to blue/purple [C]
and finally to violet [D]. Write the structures of
complexes [A], [B], [C] and [D].
18 [2]

a)Predict the order of the reaction.

b)What is the slope of the curve?

19 Explain the mechanism of dehydration steps of ethanol : [2]

OR
Name the reagents used in the following reactions :
a)Bromination of phenol to 2, 4, 6-tribromophenol
b)Butan-2-one to Butan-2-ol
 c)Friedel–Crafts alkylation of anisole
d)Oxidation of primary alcohol to carboxylic acid.
20 Account for the following: [2]
a)Although –NH2 is o/p directing group, yet aniline on nitration gives a
significant amount of m-nitroaniline.
b)Aniline does not go Friedel Crafts reaction.
21 Write the products of the following reactions: [2]

SECTION C
This section contains 7 questions with internal choice in one question.
The following questions are short answer type and carry 3 marks
each.
22 Calculate e.m.f. of the following cell at 298K: [3]
2Cr(s) + 3Fe2+(0.1M) → 2Cr3+(0.01M) + 3Fe(s)
Given: E0(Cr3+∣Cr) = −0.74V, E0(Fe2+∣ Fe) = −0.44V
23 a)Write the structure of an isomer of compound C4H9Br which is most [3]
reactive towards SN1 reaction.
b)What happens when CH3Br is treated with KCN?
c)Why does p-dichlorobenzene have a higher melting point than its o-
and m- isomers?
24 The data given below is for the reaction, 2N2O5(g) → 4NO2(g) + O2(g) [3]
at 298 K :

Determine for this reaction:

a)Order of reaction b}Rate constant c)Rate law.
25 Write the structures of A, B and C in the following reactions: [3]

26 (a) Write the name of two monosaccharides obtained on hydrolysis of [3]

lactose sugar.
(b) Name any one fat soluble vitamin, its source and the diseases caused
 due to its deficiency in diet.

27 (a) Which of the following isomers is more volatile : [3]

o-nitrophenol or p-nitrophenol?
(b) How would you obtain
i)Picric acid (2, 4, 6-trinitrophenol) from phenol.
ii)2-Methylpropene from 2-methylpropanol?
28 What is the structural difference between a nucleoside and a nucleotide? [3]
What happens when D-glucose is treated with HI ?
Give two examples of globular proteins.

SECTION D
The following questions are case -based questions. Each question
has an internal choice and carries 4 (1+1+2) marks each. Read the
passage carefully and answer the questions that follow.
29 Electrochemistry plays a very important part in our daily life. [4]
Electrochemical cell converts chemical energy of redox reaction into
electricity. Mercury cell, Dry cells are primary cells whereas Ni—Cd
cell, lead storage battery are secondary
cells. A 38% solution of sulphuric and is used in lead storage battery.
Its density is 1.30 g mL–1. The battery holds 3.5 L of the acid. During
the discharge of the battery, the density of H2SO4 falls to 1.14 g mL–1
(20% solution by mass) (Molar mass of H2SO4 is 98 g mol–1).
a)Which cell is used in hearing aids and watches?
b)How much electricity in Faraday is required to carry out the
reduction of one mole of PbO2?
c)Write the reactions taking place at cathode and anode in lead storage
battery when the battery is in use. What happens on charging the
battery?
Or
(c) Mention the reactions occurring at (i) anode, (ii) cathode, during
working of a mercury cell. Why does the voltage of a mercury cell
remain constant during its operation?
30 As in case of organic compounds, coordination compounds also show [4]
two type of isomerism viz. structural isomerism and stereoisomerism.
There are four types of structural isomerism shown by coordination
compounds viz. ionization isomerism, hydrate isomerism, linkage
isomerism and coordination isomerism. Similarly, there are two types
of stereoisomerism viz. geometrical isomerism and optical isomerism.
Geometrical isomerism is shown by square planar as well as octahedral
complexes whereas optical isomerism is shown by octahedral
complexes.
a)Write the coordination isomer of [Cu(NH3)4] [PtCl4].
b)Name the ionization isomer of [Cr(H2O)5Br]SO4.
c)Indicate the types of isomerism exhibited by the following
complexes : i)[Co(NH3)5(NO2)]2+ ii)[Co(en)3]Cl3
Or
Draw the structures of:
i)cis- dichloridotetracyanochromate(III)
ii)mer- triamminetrichloridocobalt (III)

SECTION E
The following questions are long answer type and carry 5 marks
each. All questions have an internal choice.
31 Arrange the following compounds in increasing order of their property as [5]
indicated:
a)Benzoic acid, 4-Nitrobenzoic acid, 3,4-Dinitrobenzoic acid, 4-
Methoxybenzoic acid (acid strength)
b)Propanal, Ethanal, Propanone, Butanone. (reactivity in nucleophilic
addition reactions)
c)Illustrate the following name reactions giving a chemical equations in
each case :
i)Hell-Volhard-Zelinsky reaction ii)Cannizzaro’s reaction
d)Although phenoxide ion has more resonating structures than
carboxylate ion, the carboxylic acid is a stronger acid than phenol.
Explain
Or
How will you bring about the following conversions in not more than
two steps?
a)Benzoic acid to Benzaldehyde
b)Propanone to Propene
c)Benzene to m-Nitroacetophenone
d)Write the chemical test to distinguish:
i)Propanal and propanone
ii)Benzaldehyde and acetophenone
32 How would you account for the following: [5]
a)Highest fluoride of Mn is MnF4 whereas the highest oxide is Mn2O7.
b)Cu2+ salts are coloured, while Zn2+ salts are white.
c)The members of the actinoid series exhibit a larger number of
oxidation states than the corresponding members of the lanthanoid
series.
d)With the same d-orbital configuration (d4),Cr2+ is a reducing agent
while Mn3+ is an oxidising agent.
e)Transition metals and their compounds act as catalyst.
Or
a)Which metal in the first transition series (3d-series) exhibits +1
oxidation state most frequently and why?
b)Write the electronic configuration of Ce3+ ion, and calculate the
magnetic moment on the basis of ‘spin-only’ formula. [Atomic no. of
Ce = 58]
c)How does acidified potassium permanganate solution react with
iron (II) ions and (ii) oxalic acid?
Write the ionic equations for the reactions.
33 (i).Calculate the amount of KCl which must be added to 1 kg of water
so that the freezing point is depressed by 2K(the Kf for water=1.86 K
Kg mol-1)
(ii)Define azeotropes .What type of azeotrope is formed by negative
deviation from Roult's law?Give an example.
Or
(i)A solution containing 15 g Urea (molar mass=60gmol-1) per litre of
solution in water has the same osmotic pressure(isotonic) as a solution
of glucose (molar mass=180 g mol-1) in water.Calculate the mass of
glucose present in one litre of its solution.
(ii)Define the term 'Osmotic pressure'.What is the advantage of using
osmotic pressure as compared to other colligative properties for the
determination of molar masses of macromolecular solutes in solutions?
 KENDRIYA VIDYALAYA SANGATHAN: HYDERABAD REGION
MODEL QUESTION PAPER -12 (2024-25)

CLASS: XII MAX.MARKS: 70

SUBJECT: CHEMISTRY (THEORY) DURATION: 3 Hours
General Instructions:
Read the following instructions carefully.
a) There are 33 questions in this question paper with internal choice.
b) SECTION A consists of 16 multiple-choice questions carrying 1 mark each.
c) SECTION B consists of 5 very short answer questions carrying 2 marks each.
d) SECTION C consists of 7 short answer questions carrying 3 marks each.
e) SECTION D consists of 2 case- based questions carrying 4 marks each.
f) SECTION E consists of 3 long answer questions carrying 5 marks each.
g) All questions are compulsory.
h) Use of log tables and calculators is not allowed

SECTION-A
The following questions are multiple -choice questions with one correct answer. Each
question carries 1mark. There is no internal choice in this section.
Q.NO QUESTIONS MARKS
1 One Faraday of electricity is passed through molten Al2O3, 1
aqueous solution of CuSO4 and molten NaCl taken in three
different electrolytic cells connected in series. The mole ratio of
Al, Cu and Na deposited at the respective cathode is
(a) 2 : 3 : 6 (b) 6 : 2 : 3
(c) 6 : 3 : 2 (d) 1 : 2 : 3
2 In the electrochemical reaction, 2Fe3+ + Zn  Zn2+ + 2Fe2+ 1
increasing the concentration of Fe2 +
(a) increases the cell emf (b) increases the current flow
(c) decreases the cell emf (d) alters the pH of the solution
3 The temperature coefficient of a reaction is: 1
a)ratio of rate constants at two temperatures differing by 1°C
b)ratio of rate constants at temperature 35°C and 25°C
c)ratio of rate constants at temperature 30°C and 25°C
d)specific reaction rate at 25°C
4 Which of the following pairs of ions is colourless? 1
(a)Ti3+, Cu2 + (b) Sc3 +, Zn2 + (c) Co2+, Fe3+ (d) Ni2 +,
V3 +

5 In the laboratory, manganese (II) salt is oxidised to permanganate ion in 1

aqueous solution by
(a) hydrogen peroxide (b) conc. nitric acid
(c) dichromate (d) peroxodisulphate
6 The helical structure of protein is stabilized by: 1
(a) dipeptide bonds (b) hydrogen bonds
(c) ether bonds (d) peptide bonds
7 Phenol is less acidic than . 1
(a) ethanol (b) o–nitrophenol
(c) o-methylphenol (d) o-methoxyphenol
8 Which of the following cannot be made by using Williamson Synthesis: 1
(a) Methoxybenzene (b) Benzyl p-nitrophenyl ether
(c) tert. butyl methyl ether (d) Ditert. butyl ether
9 Benzaldehyde reacts with Con. NaOH to give: 1
(a). benzyl alcohol + sodiumbenzoate
(b). sodium benzoate+methanol
(c). benzyl alcohol +methanol
(d). sodium benzoate + sodium formate
10 Which of the following will not give aldol condensation? 1
(a) Phenyl acetaldehyde (b) 2-Methylpentanal
(c) Benzaldehyde (d) 1-Phenylpropanone
11 Which of the following is incorrect for primary amines? 1
a)On reaction with nitrous acid alkylamines produce alcohol
b)On reaction with nitrous acid arylamines produce phenol
c)Alkylamines are more basic than ammonia
d)Alkylamines are more basic than arylamines
12 Glucose when heated with Br2 Water Gluconic Acid is formed. This 1
is because it contains:
(a) an aldehydic group (b) -CH2OH group
(c) a ring structure (d) five hydroxyl groups
Given below are two statements labelled as Assertion (A) and Reason (R)
Select the most appropriate answer from the options given below:
a)Both A and R are true and R is the correct explanation of A
b)Both A and R are true but R is not the correct explanation of A.
c)A is true but R is false.
d) A is false but R is true

13 Assertion (A): The hydrolysis of methyl acetate by dil HCI is a pseudo first 1
order reaction.
Reason (R): HCI acts as a catalyst for the hydrolysis.
14 Assertion (A): Aryl halides undergo nucleophilic substitution with ease. 1
Reason (R): Carbon-halogen bond in aryl halide has partial double
bondcharacter.
15 Assertion (A): p-nitrophenol is more acidic than o-nitrophenol 1
Reason (R): Intramolecular hydrogen bonding makes o-isomer weaker than
p-isomer
16 Assertion: Even though there are two NH2 groups in semicarbazide, only 1
one reacts with carbonyl compounds.
Reason: Semicarbazide has two NH2 groups out of which one is in
resonance with the carbonyl group.
SECTION-B
This section contains 5 questions with internal choice in one question. The following
questions are very short answer type and carry 2 marks each.
17 A solution is prepared by dissolving 5.64 g of glucose in 60 g of 2
water.Calculate the molality of the solution
18 Define the following terms: 2
(i). Peptide bond (ii). Anomers
19 For the reaction, A + B -------Products, rate is given as, rate = k[A][B]2. 2
How will the rate change if volume of the reaction mixture is reduced to 1/3rd
of its original volume?
20 Write chemical equations when 2
a)Sec.butyl chloride is treated with alcoholic KOH.
b)Chlorobenzene is treated with CH3COCl in presence of anhydrous AlCl3.
21 Illustrate the following name reactions giving suitable example in each case: 2
(i) Clemmensen reduction (ii) Hell-Volhard-Zelinsky reaction
OR
i)Out of p-tolualdehyde and p-nitrobenzaldehyde, which one is more reactive
towards nucleophilic addition reactions, why?
ii)Write the structure of the product formed when acetone reacts with 2,4- DNP
reagent.

SECTION-C
This section contains 7 questions with internal choice in one question. The following
questions are short answer type and carry 3 marks each.
22 Define molar conductivity and how does it vary with concentration for 3
(i). Weak electrolyte (ii). Strong electrolytes? Give reasons for these
variations.
OR
Determine the values of equilibrium constant (Kc) and ΔG° for the
following reaction :
Ni(s) + 2Ag+ (aq) → Ni2+ (aq) + 2Ag(s). E° = 1.05 V
23 The rate constants of a reaction at 500K and 700K are 0.02s–1 and 3
0.07s–1 respectively. Calculate the value of Ea.
24 Name the reagents used to convert 3
(i). 1-chloropropane to 1-nitropropane
(ii). Bromoethane to ethoxyethane
(iii). Bromoethane to butane
25 [Cr (NH3)6] 3+ is paramagnetic while [Ni (CN)4] 2− is diamagnetic. 3
Explain why?
26 How would you convert 3
(i). Phenol into benzene
(ii)Phenol into 2-acetoxy benzoic acid
(iii)Aniline to phenol
27 Give a chemical test to distinguish between the following pairs of 3
organic compounds.
(i). Benzaldehyde and Acetophenone
(ii). Phenol and Benzoic acid
(iii). Formic acid and Acetic acid
28 What happens when D-glucose is treated with the following reagents? 3
(i) NH2OH (ii) HCN (iii) Acetic Anhydride
SECTION-D
The following questions are case -based questions. Each question has an internal
choice and carries 4 (1+1+2) marks each. Read the passage carefully and answer
the questions that follow.

29 Coordination compounds play a vital role in our lives. The importance 1+1+2
of these compounds can be realized from the fact that life would not
have been possible without the existence of chlorophyll in plants and
haemoglobin in the blood of the animals. The field of such compounds
has expanded very fast in recent years and coordination compounds are
playing important roles in analytical chemistry, polymerization
 reactions, metallurgy and refining of metals, organic syntl1esis,
electroplating, biochemistry, water purification, textile dyeing and
bacteriology.
a)Which is used in cancer chemotherapy?
b)Name the reagent used for identifying nickel ion in solution.
c)What are facial and meridional isomers? Explain with examples .
30 At infinite dilution, when the dissociation of electrolyte is complete, 1+1+2
each ion makes a definite contribution towards the molar conductance
of electrolyte, irrespective of the nature of the other ion with which it
is associated. The molar conductance of an electrolyte at infinite
dilution can be expressed as the sum of the contributions from its
individual ions.
E°m = γ+λ°+ + γ-λ°-
where, v+ and v–are the number of cations and anions respectively.
(i). How much charge is required for the reductions of 1 mol of Al3+ to
Al?

(ii). Predict the products of electrolysis in a dilute solution of H2SO4

with platinum electrodes

(iii). Λ m0 for NaCl, HCl and NaAc are 126.4, 425.9 and 91.0 S cm2
mol–1 respectively. Calculate Λm 0 for HAc.
Or
The resistance of a conductivity cell containing 0.001M KCl solution at
298K is 1500 Ω. What is the cell constant if conductivity of 0.001M
KCl solution at 298 K is 0.146 × 10–3 S cm–1
SECTION-E
The following questions are long answer type and carry 5 marks each. All questions
have an internal choice
31 (a)Define the following terms: 2+3
(i). Molal elevation constant. (ii). Osmotic Pressure
(b). Solution of urea is prepared by dissolving 6 gm urea in 1 litre.
Determine the osmotic pressure of that urea solution at 300 K. (R =
0.0821L atom K-1 mol-1(Molecular mass of urea = 60)
Or
(a). Define the following terms:
(i). Mole fraction (ii). Molality
b). A solution of 1.25 g of a certain non-volatile substance in 20 g of
water freezes at 271.94 K. Calculate the molecular mass of the solute
(Kf = 1.86 K kg mol-I).

32 Attempt any five of following . 2+3

a) Explain Why transition metals show variable oxidation states.
b)What is lanthanoid contraction?
c)Describe the oxidizing action of potassium dichromate and write
the ionic equations for its reaction with iron (II) solution.
d)Explain the following observations : Cu+1 ion is unstable in aqueous
solution.
e)How would you account for the following :Cr2+ is reducing in nature
while with the same d-orbital configuration (d4) Mn3+ is an oxidising
agent.
f)Which metal in the first transition series (3d series) exhibits +1
oxidation state most frequently and why?
g)Transition elements show high melting points. Why?
33 (a). Account for the following
(i) Methylamine in water reacts with ferric chloride to precipitate hydrated
ferric oxide.
(ii) Although amino group is o and p – directing in aromatic electrophilic
substitution reactions, aniline on nitration gives a substantial amount of m-
nitroaniline.
(iii) Aniline does not undergo Friedel-Crafts reaction.
(b). Arrange the following
(i) In decreasing order of basic strength in gas phase:
C2H5NH2, (C2H5)2NH, (C2H5)3N and NH3
(ii ) In increasing order of boiling point: C2H5OH, (CH3)2NH, C2H5NH2

Or
A colourless substance ‘A’ (C6H7N) is sparingly soluble in water and
gives a water-soluble compound ‘B’ on treatment with mineral acid. On
reacting with CHCl3 and alcoholic potash, ‘A’ produces an obnoxious
smell due to compound ‘C’ formation. The reaction of ‘A’ with benzene
sulphonyl chloride gives compound ‘D’, which is soluble in alkali. With
NaNO2 and HCI, ‘A’ forms compound ‘E’, which reacts with phenol in
an alkaline medium to give’ F’ orange dye. Identify compounds ‘A’ to
‘F’.
 KENDRIYA VIDYALAYA SANGATHAN: HYDERABAD REGION
MODEL QUESTION PAPER -13 (2024-25)

CLASS: XII MAX.MARKS: 70

SUBJECT: CHEMISTRY (THEORY) DURATION: 3 Hours

General Instructions:
Read the following instructions carefully.
a) There are 33 questions in this question paper with internal choice.
b) SECTION A consists of 16 multiple-choice questions carrying 1 mark each.
c) SECTION B consists of 5 very short answer questions carrying 2 marks each.
d) SECTION C consists of 7 short answer questions carrying 3 marks each.
e) SECTION D consists of 2 case- based questions carrying 4 marks each.
f) SECTION E consists of 3 long answer questions carrying 5 marks each.
g) All questions are compulsory.
h) Use of log tables and calculators is not allowed
SECTION A
The following questions are multiple-choice questions with one correct answer. Each question carries 1 mark.
There is no internal choice in this section.
1. The value of Henry’s constant KH is -------- 1
a. Greater for gases with higher solubility.
b. Greater for gases with lower solubility.
c. Constant for all gases.
d. Not related with solubility of gases
2. Which one of the following halides contains sp2 C-X bond: 1
a. Allylic halide
b. Benzylic halide
c. Alkyl halide
d. Vinylic halide
3 KMnO4 acts as oxidizing agent in alkaline medium. When alkaline KMnO 4 is treated with KI, 1
iodide ion is oxidized to:
a. I2
b. IO3-
c. IO-
d. IO4-
4. Which of the following aqueous solutions should have the highest boiling point 1
a. 1.0 M NaOH
b. 1.0 M Na2SO4
c. 1.0 M NH4NO3
d. 1.0 M KNO3

1
5. The following curve is obtained when molar conductivity is plotted against the square root of 1
concentration, C 1/2 for two electrolytes A and B.

Considering the above curve, which of the following statement is correct?

a. Electrolyte A is a strong electrolyte, its molar conductivity increases slightly with increase in
dilution.
b. Electrolyte A is a weak electrolyte, its molar conductivity increases with increase in dilution.
c. Electrolyte B is a strong electrolyte, its molar conductivity increases with increase in dilution.
d. Electrolyte B is a weak electrolyte, its molar conductivity decreases with increase in dilution.
6.. Reduction of nitrobenzene in presence of Sn + HCl gives the final product: 1
a. Aniline
b. Phenylhydroxylamine
c. p-aminophenol
d. Azobenzene
7. The solution of the complex [Cu (NH3)4]SO4 in water: 1
a. Give the test of Cu2+ ion
b. Give the test of NH4+
c. Give the test of SO42- ions
d. Does not give the test of any of the above
8. Williamson’s synthesis of preparing dimethyl ether is an: 1
a. SN1 reaction
b. Elimination reaction
c. SN2 reaction
d. Nucleophilic addition reaction
9 The formation of cyanohydrin from propanone is which type of reaction? 1
a. Electrophilic substitution
b. Nucleophilic substitution
c. Electrophilic addition
d. Nucleophilic addition
10. During dehydration of alcohols to alkenes by heating with concentrated H 2SO4 Protonation of 1
alcohol molecule
a. Formation of carbocation
b. Elimination of water
c. Formation of an ester
d. Formation of an ester
11 Dinucleotide is obtained by joining two nucleotide together by phosphodiester linkage .Between 1
which carbon atom of pentose sugars of nucleotides are these linkages present
a. 5’ and 3’
b. 1’ and 5’
c. 5’ and 5’
d. 3’ and 3’
12 A chelating agent has two or more than two donor atoms to bind to a single metal ion. Which of 1
the following is not a chelating agent?
a. Thiosulphato
2
 b. EDTA
c. Oxalato
d. Ehane-1,2-diamine
13 Given below are two statements labelled as Assertion (A) and Reason (R) 1
Assertion (A): o- Nitrophenol and p- Nitrophenol are separated by steam distillation.
Reason (R): o- Nitrophenol has intermolecular hydrogen bonding while p-Nitrophenol has
intramolecular hydrogen bonding.
Select the most appropriate answer from the options given below:
a. Both A and R are true, and R is the correct explanation of A
b. Both A and R are true, but R is not the correct explanation of A.
c. A is true, but R is false.
d. A is false, but R is true.
14 Given below are two statements labelled as Assertion (A) and Reason (R) 1
Assertion (A): Monomeric unit of proteins exist as zwittter ion.
Reason (R) : In aqueous solution the carboxyl group lose a proton and amino group accept a
proton therefore amino acid contains both positive and negative charges.
Select the most appropriate answer from the options given below:
a. Both A and R are true, and R is the correct explanation of A
b. Both A and R are true, but R is not the correct explanation of A.
c. A is true, but R is false.
d. A is false, but R is true.
15 Given below are two statements labelled as Assertion (A) and Reason (R) 1
Assertion (A): Transition metals have high melting point.
Reason (R) : The involvement of greater number of (n-1)d and ns electrons in the inter atomic
metallic bonding.
Select the most appropriate answer from the options given below:
a. Both A and R are true, and R is the correct explanation of A
b. Both A and R are true, but R is not the correct explanation of A.
c. A is true, but R is false.
d. A is false, but R is true.
16 Given below are two statements labelled as Assertion (A) and Reason (R) 1
Assertion (A): N,N-Diethylbenzene sulphonamide is insoluble in alkali.
Reason (R): Sulphonyl group attached to nitrogen atom is strong electron withdrawing group.
Select the most appropriate answer from the options given below:
a. Both A and R are true, and R is the correct explanation of A
b. Both A and R are true, but R is not the correct explanation of A.
c. A is true, but R is false.
d. A is false, but R is true.
SECTION B
This section contains 5 questions with internal choice in one question. The following questions are very
short answer type and carry 2 marks each.

17 Calculate the mass of ascorbic acid (C6H8O6) to be dissolved in 75g of acetic acid to lower its 2
freezing point by 1.5 0C. (Kf = 3.9 Kkg/mol)
18 What are the products of hydrolysis of lactose and Sucrose? 2
19 Arrange each set of compounds in order of increasing boiling points 2
i) Bromomethane, Bromoform , Chloromethane, Dibromomethane
ii). 1- Chloropropane, Isopropylchloride, 1-Chlorobutane
OR
Arrange each set of compounds in order of decreasing reactivity towards (SN2) displacement:
3
 i). 2-Bromo-2-methylbutane, 1-Bromopentane, 2-Bromopentane.
ii). 1-Bromo-3-methylbutane, 2-Bromo-2-methylbutane, 2-Bromo-3-methylbutane.
20 a) Give a chemical test to distinguish between:
i) Benzaldehyde and acetaldehyde 2
ii) Pentan-2-one and Pentan-3-one
21 In the following ions: Mn3+, V3+, Cr3+, Ti4+ (Atomic no. Mn-25, V- 23, Cr- 24, Ti-22) 2
i) Which ion is most stable in its aqueous solution?
ii) Which ion is the strongest oxidizing agent?
iii) Which ion is colourless?
iv) Which ion is has the highest number of unpaired electrons?

SECTION C
This section contains 7 questions with internal choice in one question. The following questions are short
answer type and carry 3 marks each.

22 a) Write the equation : 3

Phenol is treated with chloroform in presence of NaOH
b) Ethanol is dehydrated to ethoxyethane in presence of sulphuric acid at 413K, write the
mechanism of the reaction.
23 a) Give reason : 3
Measurement of osmotic pressure method is preferred for the determination of molar mass of
macromolecules such as polymers and proteins.
b) Determine the amount of CaCl 2 (i = 2.47) dissolved in 2.5 litre of water such that its osmotic
pressure is 0.75 atm at 270C.
24 a) Define Kohlrausch law. 3
b) The standard electrode potential for the cell is 0.236V. Calculate the standard Gibbs energy
and equilibrium constant for the reaction
Fe3+(aq) + I -(aq) ---------- Fe2+ (aq) + I2(s) (Given Antilog(0.98)=9.68)
25 Give reason for the following: 3
a. Sc (Z =21) does not exhibit variable oxidation states and yet it is regarded as transition
element. Why?
b. Why Zn2+ salts are white while Cu2+ salts are blue.?
c. Actinoid contraction is greater from element to element than lanthanoid contraction.
26 a) Write the structure and IUPAC name of the product when chlorobenzene is treated with 3
methyl chloride in presence of sodium metal and dry ether. ( write complete reaction)
b) Why is chlorobenzene resistant to nucleophilic substitution reaction?
OR
a) What happens when :
i) Ethyl chloride is treated NaI in presence of acetone.
ii) Diazonium salt is treated with cuprous bromide.
b) Explain why Grignard reagent should be prepared under anhydrous conditions.
27 The time required for 10% completion of a first order reaction at 298K is equal to that required 3
for its 25% completion at 308K .Calculate activation energy of the reaction? Given log (2.72) =
0.436

4
 28 Answer the following questions:
a. “Each polypeptide chain has amino acids linked with each other in a specific sequence”, 3
Which type of structure of protein the given statement refers.
b. The three-dimensional folding of polypeptide chains forms fibrous and globular proteins.
Write differences between fibrous and globular proteins.
c. What is meant by nucleoside and nucleotide?
SECTION D
The following questions are case-based questions. Each question has an internal choice and carries 4
(1+1+2) marks each. Read the passage carefully and answer the questions that follow.
29 Diazonium salts are colorless crystals that darken when exposed to air. Aryl diazonium salts are
frequently used as intermediates in chemical synthesis. 4
When a primary aromatic amine is converted to diazonium salts, a method known as diazotization
is used instead to get diazonium salt formation. Reaction of nitrous acid with aromatic amines is
one of the most common processes for creating diazonium salt.
Diazonium salts are used in the dye and pigment industries to create coloured materials. Dyes that
are applicable to many different types of fibers can be dyed with colours .They are also used to
synthesize various chemical molecules, particularly aryl derivatives.

Answer the following questions:

a) Explain coupling reaction.
b) pKb value of aniline is quite high, Explain.
c) Convert the following:
i)Aniline to Benzonitrile
ii)Aniline to Iodobenzene
OR
i) Give a chemical test to distinguish between N- methylaniline and aniline.
ii)Why is benzene diazonium salt not stored and is used immediately after its preparation.
30 In some reactions, the rate is apparently independent of the reactant concentration. The rates of 4
these zero-order reactions do not vary with increasing nor decreasing reactants concentrations.
This means that the rate of the reaction is equal to the rate constant, k of that reaction.
This property differs from both first-order reactions and second-order reactions. Nitrous oxide
will decompose exothermically into nitrogen and oxygen, at a temperature of approximately 575 °C
2N2O−→ 2N2(g)+O2(g)
This reaction in the presence of a hot platinum wire (which acts as a catalyst) is zero-order.
In this case, the N2O molecules that react are limited to those that have attached themselves to the
surface of the solid catalyst. Once all of the sites on the limited surface of the catalyst have been
occupied, additional gas-phase molecules must wait until the decomposition of one of the adsorbed
molecules frees up a surface site.
Answer the following questions:
a. The given example of decomposition of nitrous oxide represents zero order reaction, write
another example of zero order reaction.
b. Using the integrated form of the rate law, determine the rate constant k of a zero-order reaction
if the initial concentration of substance A is 1.5 M and after 120 seconds the concentration of
substance A is 0.75 M.
c. Define Half-life of a reaction. Using the substance from the previous problem (b), what is the
half-life of substance A if its original concentration is 1.2 M?
OR
Define order of a reaction. If the original concentration is reduced to 1.0 M in the previous
problem, what will be the effect on the half-life .

5
 SECTION E
The following questions are long answer type and carry 5 marks each. All questions have an internal
choice.
Q31 a. Write the advantages of fuel cell. 5
b. How much electricity in terms of coulombs is required to produce 20.0g of Ca from molten
CaCl2.
c. Conductivity of 0.00241 M acetic acid is 7.896 x 10 -5 S cm-1. Calculate its molar
conductivity. If Λm0, for acetic acid is 390.5 S cm2 mol-1, what is its dissociation constant?
OR
a. Write the advantages of the Leclanche (dry cell).
b. How much electricity in terms of coulombs is required to produce 40.0g of Al from molten
Al2O3.
c. Calculate the e.m.f of the following cell at 298K:
Mg(s) | Mg2+(0.001M) || Cu2+(0.0001M) | Cu(s)
Given E0 Mg2+ / Mg = -2.37V
E0 Cu2+ / Cu = +0.34V
Q32 a. Although phenoxide ion has more number of resonating structures than carboxylate ion,
carboxylic acid is a stronger acid than phenol. Give two reasons. 5
b. Arrange the following compounds in increasing order of their acidic strength:
Benzoic acid , 4-Nitrobenzoic acid , 3,4- Dinitrobenzoic acid , 4-Methoxybenzoic acid.
c. Write the structure and IUPAC name of the product formed when.
i)Benzoyl chloride is hydrogenated over catalyst Pd on BaSO4
ii)Toluene undergoes oxidation with alkaline KMnO4.
OR
a). An organic compound ‘A’ with molecular formula C8H8O gives positive DNP and iodoform
test. It does not reduce Tollens’ or Fehling’s reagent and does not decolorize bromine water. On
oxidation with chromic acid, it gives a carboxylic acid ‘B’ with molecular formula C 7H6O2. B on
treating with thionyl chloride gives compound C. On hydrogenation over catalyst Pd on barium
sulphate C gives compound D which is used in perfumery. D on heating with conc alkali gives E
and F. Deduce the structures A, B, C, D, E and F.
b). Arrange the following compounds in increasing order of their acidic strength:
CH3CH2CH(Br)COOH, CH3CH(Br)CH2COOH, (CH3)2CHCOOH, CH3CH2CH2COOH.
33 Attempt any five of the following: 5
a) Both [Co (NH3)6] and [CoF6] are octahedral complexes. Predict the magnetic nature of the
3+ 3-

two complexes, explain it on the basis of CFT and also write its electronic configuration.
b). Write the IUPAC names of the following coordination compounds:
i) [Pt (NH3)2 Cl (NO)2] ii)K3[Cr (C2 O4)3]
c) Which of the following is more stable complex and why ?
[Co (NH3)6]3+ or [Co (en)3]3+
d).Write the state of hybridization and magnetic behaviour of [Ni(CN)4]2-
e).Draw the geometrical isomer of the complex [Co(en)2Cl2]+
f.Define with example
i) Ambidentate ligand
ii) Homoleptic complex
g). Why are low spin configuration rarely observed in tetrahedral coordination complex?

6
 KENDRIYA VIDYALAYA SANGATHAN: HYDERABAD REGION
MODEL QUESTION PAPER -14 (2024-25)

CLASS: XII MAX.MARKS: 70

SUBJECT: CHEMISTRY (THEORY) DURATION: 3 Hours

General Instructions:
Read the following instructions carefully.
a) There are 33 questions in this question paper with internal choice.
b) SECTION A consists of 16 multiple-choice questions carrying 1 mark each.
c) SECTION B consists of 5 very short answer questions carrying 2 marks each.
d) SECTION C consists of 7 short answer questions carrying 3 marks each.
e) SECTION D consists of 2 case- based questions carrying 4 marks each.
f) SECTION E consists of 3 long answer questions carrying 5 marks each.
g) All questions are compulsory.
h) Use of log tables and calculators is not allowed
SECTION A
The following questions are multiple-choice questions with one correct answer. Each question carries 1 mark.
There is no internal choice in this section.
1. The values of Van’t Hoff factors for KCl, NaCl and K2SO4 , respectively 1
a) 2, 2 and 2 b) 2, 2 and 3 c) 1, 1 and 2 d) 1, 1 and 1
2. In the reaction A + B  product, if B is taken in excess, then it is an example of 1
a) Second order reaction b) Zero order reaction
c) Pseudo first order reaction d) First order reaction
3 The colour of transition metal compounds is due to: 1
a) s-s transitions b) p-p transitions c) d-d transitions d) f-f transitions
4. How many ions are produced from [Co(NH3)6]Cl3 in solution? 1
a) 6 b) 4 c) 3 d) 2
5. What is the correct order of reactivity of alcohols in the following reaction? 1
R—OH + HCl → R—Cl + H2O
a) 1° > 2° > 3° b) 1° < 2° > 3° c) 3° > 2° > 1° d) 3° > 1° > 2°
6.. What is the correct order of boiling of isomeric dichlorobenzenes? 1
a) ortho>meta>para b) para>meta>ortho
c) para>ortho>meta d) meta>ortho>para
7. If the graph plotted between ln k and 1/T for the first order reaction, the slope of the straight line so 1
obtained is given by
a) - Ea/R b) - Ea/2.303R
c) - 2.303/(Ea R) d) - Ea/2.303
8. The oxidation of toluene to benzaldehyde by chromyl chloride is called 1
a) Etard reaction b) Riemer–Tiemann reaction
c) Wurtz reaction d) Cannizzaro’s reaction
9 Low concentration of oxygen in the blood and tissues of people living at high altitude is due to _ 1
a) low temperature b) low atmospheric pressure
c) high atmospheric pressure d) both low temperature and high atmospheric
pressure
10. Which one of the following ions exhibits colour in aqueous solution 1
a)Sc3+ b)Ni2+
c)Ti4+ d)Zn2+
11 Which of the following will give Cannizzaro reaction?
 a)CH3CHO b)CH3COCH3
c)(CH3)3CCHO d)CH3CH2CHO
12 The electrolyte used in mercury cell is: 1
(a) Concentrated sulphuric acid (b) Ammonium chloride paste
(c) KOH and ZnO paste (d)Sodium chloride solution
In the following questions a statement of assertion followed by a statement of reason is given.
Choose the correct answer out of the following choices.
(a) Both assertion and reason are correct and the reason is correct explanation of assertion.
(b) Both assertion and reason are correct but reason does not explain assertion.
(c) Assertion is correct but reason is incorrect.
(d) Assertion is incorrect but reason is correct.
13 Assertion : Order of the reaction can be zero or fractional. 1
Reason : We cannot determine order from balanced chemical equation
14 Assertion: [Ni(CN)4]2- is square planar and diamagnetic. 1
Reason: It has no unpaired electrons due to the presence of a strong ligand.
15 Assertion: Tomatoes which are stored for sometime are better source of vitamin C than fresh 1
tomatoes.
Reason : On prolonged exposure to air ,Vitamin C is destroyed due to ariel oxidation.
16 Assertion: Aliphatic amines are stronger bases than ammonia. 1
Reason: Aromatic amines are weaker bases than ammonia.
SECTION B
This section contains 5 questions with internal choice in one question. The following questions are very short
answer type and carry 2 marks each.

17 Give reasons for the following- 2

a) Transition elements act as catalysts
b) Cu(I) ion is not known in aqueous solution.
18 State Faraday's First law 2
19 Write IUPAC names of 2

(a) (b)
OR
Chlorobenzene is less reactive towards nucleophilic substitution reaction. Give two reasons.
20 Complete the following equations :
(i) C6H5N2Cl + H3PO2 + H2O → 2
(ii) C6H5NH2 + Br2 (aq) →
21 Define the following with a suitable example. 2
a) Oligosaccharides
b) Denaturation of proteins
SECTION C
This section contains 7 questions with internal choice in one question. The following questions are short
answer type and carry 3 marks each.
22 (i)State Kohlrausch’s law of independent migration of ions. 3
(ii) Calculate the degree of dissociation (α) of CH3COOH if λm and λom of CH3COOH are 48
Scm2 mol-1 and 400 Scm2 mol-1 respectively.
23 When pyrolusite ore MnO2 is fused of with KOH in presence of air, a green colored compound (A) 3
is obtained which undergoes disproportionation reaction in acidic medium to give purple colored
compound (B).
a) Write the formulae of (A) and (B).
b) What happens when compound (B) is heated?
 24 How are the following conversions carried out? 3
(i) Aniline to chlorobenzene (ii) Chlorobenzene to p-nitrophenol
25 Give chemical test to distinguish between following pair of compounds 3
(a)Ethanoic acid and Phenol (b)Ethanoic acid and Methanoic acid
(c)Benzoic acid and Ethyl benzoate
26 (i) Deficiency of which vitamin causes night blindness? 3
(ii) Name the base that is found in nucleotide of RNA only.
(iii) Glucose on reaction with HI gives n-hexane. What does it suggest about structure of glucose?
OR
(a) What type of linkage is responsible for primary structure of proteins ?
(b) Name the location where protein synthesis occurs in our body
(c) Name the components of starch. How do they differ from each other structurally ?
27 Give reasons for the following : 3
(i) Why pka of F-CH2-COOH is lower than that of Cl–CH2-COOH
(ii) Carboxylic acids are stronger acids than phenols
28 (a) Write the product of electrolysis of aq. NaCI on cathode.
(b) Write the products of electrolysis when dilute sulphuric acid is electrolysed using platinum 3
electrodes.
(c) What is the role of zinc chloride in dry cell?
SECTION D
The following questions are case-based questions. Each question has an internal choice and carries 4
marks each. Read the passage carefully and answer the questions that follow.
29 Primary and secondary amines are engaged in intermolecular association due to hydrogen bonding
between nitrogen of one and hydrogen of another molecule. This intermolecular association is more 4
in primary amines than in secondary amines as there are two hydrogen atoms available for
hydrogen bond formation in it. Tertiary amines do not have intermolecular association due to the
absence of hydrogen atom available for hydrogen bond formation. Observe the histogram showing
boiling points of pentane, iso pentane, 1°,2° and 3 ° amines. Answer the questions based on table
and related concepts.

(a)Why does CH3CH2CH2CH2NH2 has higher boiling point than(C2H5)2NH and C2H5N(CH3 )2?
(b) Why does ethanol have higher boiling point than ethanamine?
(c) Why amines are more basic than alcohol?
(d) i.) Why are Primary amines more soluble in water than 2° and 3° amines?
OR
ii) Arrange the compounds shown in graph, increasing order of boiling points. Give reason
30 The rate of reaction is concerned with decrease in concentration of reactant or increase in the 4
concentration of products per unit time. It can be expressed as an instantaneous rate at a particular
instant of time the average rate over a large interval of time. Mathematical representation of rate of
reaction is given by rate law.Rate constant and order of a reaction can be determined from rate law
or its integrated rate equation.
a) What is the average rate of reaction?
 b) Write two factors that affect the rate of reaction.
c) What happens to the rate of reaction for zero order reaction?
d) i)What is the unit of k for zero order reaction?
OR
ii) For a reaction P + 2Q →Product Rate = k[P]½ [Q]1; What is the order of the reaction?

SECTION E
The following questions are long answer type and carry 5 marks each. All questions have an internal
choice.
31 A. (i) Define the following terms: 5
(a) Azeotrope (b) Osmotic pressure (c) Colligative properties
(ii) Calculate the molarity of 9.8 % (w/w) solution of H 2SO4 if the density of the solution is
1.02 g/ml. (Molar mass of H2SO4 = 98 g/mol).
(OR)
B. i) Differentiate between molarity and molality of a solution. How does a change in
temperature influence their values?
ii) Calculate the boiling point of a solution prepared by adding 15.00 g of NaCl to 250.0 g of
water. (Kb for water = 0.512 K kg mol-1, molar mass of NaCl = 58.44 g mol-1)
iii) Calculate the freezing point of an aqueous solution containing 10.50 g of MgBr 2 in 200 g
of water (Molar mass of MgBr2 = 184 g mol-1, = for water = 1.86 K kg mol-1).
32 I. (A) Write the name, structure and the magnetic behavior of each one of the following
complexes: (i)[Pt(NH3)2Cl(NO2)] (At. no. Co = 27, Pt = 78) 5
(ii)Ni(CO)4 (At. no. Ni = 28)
(B) Why [NiCl4]2-is tetrahedral explain with the help of valence bond theory and also describe
their magnetic behaviour ?.
(C) Explain why [Fe(H2O)6]3+ has a magnetic moment value of 5.92 BM whereas [Fe(CN)6]3–
has a value of only 1.74 BM.
(OR)
II. (A) Find the primary and secondary valencies of central metal ion/atom in K4[Fe(CN)6] and
[Ni(CO)4].
(B) Draw the geometrical isomers of [CoCl 2(en)2]. Also mark them correctly as cis and trans
and
which out of these be optically active?
(C) What are ambident ligands? Give two suitable example of it
33 I. a) How do you convert ethanol to propan-2-ol. 5
b) Write the mechanism of the following reaction:

c)Write the IUPAC name of the following compound:

d) Why phenol undergoes electrophilic substitution more easily than benzene?

(OR)

II. (a). Complete the following

(b) Define with examples: (i) Reimer-Tiemann reaction. (ii) Williamson’s Synthesis
(c) Write the structures of the isomers of alcohols with molecular formula C 4H10O. Which of
these will exhibit optical activity
 MODEL QUESTION PAPER -15 (2024-25)

CLASS: XII MAX.MARKS: 70

SUBJECT: CHEMISTRY (THEORY) DURATION: 3 Hours

General Instructions:
a) There are 33 questions in this question paper with internal choice.
b) Section A consists of 16 multiple-choice questions carrying 1 mark each.
c) Section B consists of 5 very short answer questions carrying 2 marks each.
d) Section C consists of 7 short answer questions carrying 3 marks each.
e) Section D consists of 2 case-based questions carrying 4 marks each.
f) Section E consists of 3 long answer questions carrying 5 marks each.
g) All questions are compulsory.
h) Use of log tables and calculators is not allowed.
SECTION A
The following questions are multiple-choice questions with one correct answer. Each
question carries 1 mark. There is no internal choice in this section.
1. An electrochemical cell can behave like an electrolytic cell when
1
(a) Ecell = 0 (b) Ecell > Eext (c) Eext > Ecell d) Ecell = Eext

2. In the elementary reaction 2A + B → A2B, if the concentration of A is doubled and that of 1

B is halved, then the rate of the reaction will
(A) increase 2 times (B) increase 4 times (C) decrease 2 times (D) remain the same
3. A plot is shown below between concentration and time t. Which of the given 1
order is indicated by the graph

(a) Zero Order (b) Second Order (c) First Order (d) Fractional Order
4. The magnetic nature of elements depends on the presence of unpaired electrons. 1
Identify the configuration of transition element, which shows highest magnetic
moment.
(a) 3d7 (b) 3d5 (c) 3d8 (d) 3d2
5. Which of the following alkyl halides will undergo SN1 reaction most readily? (a) (CH3)3C— 1
F (b) (CH3)3C—Cl (c) (CH3)3C—Br (d) (CH3)3C—I

6. Which of the following are d-block elements but not regarded as transition elements? 1
(a) Cu, Ag, Au (b) Zn, Cd, Hg (c) Fe, Co, Ni (d) Ru, Rh, Pd

7. Phenol is less acidic than: 1

2
 (a) Ethanol (b) o-nitrophenol (c) o-methyl phenol (d) o-methoxyphenol

8. A tertiary alcohol is obtained by the reaction of Grignard reagent with: 1

(a) Butanone (b) Propanone (c) Acetone (d) All of the above
9. The IUPAC name of CH3-CH=CH-CHO is: 1
(a) Buten-2-al (b) Butenal (c) But-2-enol (d) But-2-enal
10. Which of the following orders of relative strengths of acids is correct? 1
(a)
ClCH2COOH > FCH2COOH > BrCH2COOH
(b)
ClCH2COOH > BrCH2COOH > FCH2COOH
(c)
BrCH2COOH > ClCH2COOH > FCH2COOH
(d)
FCH2COOH > ClCH2COOH > BrCH2COOH

11. The correct order of the basic strength of methyl substituted amines in 1
aqueous solution is:
(a)
CH3NH2 > (CH3)2NH > (CH3)3N
(b)
(CH3)2NH > CH3NH2 > (CH3)3N
(c)
(CH3)3N >CH3NH2 > (CH3)2NH
(d)
(CH3)3N > (CH3)2NH > CH3NH2
12. Which of the following statements are not true about glucose? 1
(a) It is an aldohexose (b) On heating with HI, it forms n-hexane
(c) It is present in furanose form (d) It does not give 2,4-DNP test
For question number 13 to 16 two statements labelled as Assertion (A) and Reason
(R
Select the most appropriate answer from the options given below:
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

13. Assertion(A): Rate constant of a zero-order reaction has the same unit as the 1
rate of a reaction.
Reason(R): Rate constant of a zero-order reaction does not depend upon the
concentration of the reactant
14. Assertion(A): Tertiary alcohols get converted into an alkene instead of a 1
carbonyl compounds in the presence of heated metallic copper.
Reason(R): Tertiary alcohols prefer to undergo dehydrogenation instead of
dehydration in the presence of heated copper
15. 1
Assertion (A): For a Daniel cell, Zn(s)/Zn2+ (1.0M) // Cu2+(1.0M)/Cu(s) with
Eocell=1.1V, if the external opposing potential is more than1.1V, the electrons
flow from Cu to Zn.

3
 Reason(R): Cell acts like a Galvanic cell
16. Assertion(A): Benzoic acid does not undergo Friedel Craft’s reaction. 1
Reason(R): Carboxyl group is deactivating and the catalyst aluminium chloride
gets bonded to the carboxyl group.
SECTION B
This section contains 5 questions with internal choice in one question. The following
questions are very short answer type and carry 2 marks each.
17. Calculate the mole fraction of benzene in a solution containing 30% by mass of it 1
in CCl4. 1
18. Explain pseudo-order reaction with an example. 1
1
19. Which one in the following pairs of substances undergoes SN2 substitution 1+1
reaction faster and why?

20. (a)Define Glycosidic linkage. 1+1

(b) Why cannot vitamin C be stored in our body.
OR
(i) What type of linkage is present in nucleic acids?
Give one example each for fibrous protein and globular protein.
21. Arrange the following compounds in the increasing order of their property 2
indicated.
i) CH3COCH3, C6H5COCH3, CH3CHO (reactivity towards nucleophilic
addition reaction)
ii) Cl-CH2-COOH, F-CH2-COOH, CH3-COOH (acidic character)

SECTION-C
This section contains 7 questions with internal choice in one question. The following
questions are short answer type and carry 3 marks each
22. When a certain conductivity cell was filled with 0.1 M KCl, it has a resistance of 3
85 ohms at 25°C. When the same cell was filled with an aqueous solution of
0.052 M unknown electrolyte, the resistance was 96 ohms. Calculate the molar
conductivity of the electrolyte at this concentration. Conductivity of 0.1 M KCl =
1.29 × 10−2Ω−1cm−1
23 Write the formula of the following coordination compound: 1
Iron(III)hexacyanoferrate(II).
What type of isomerism is exhibited by the complex [Co(NH3)5Cl]SO4? 2

4
 Write the hybridisation and number of unpaired electrons inthe
complex [CoF6]3-. (Atomic Number of Co =27)
OR
(i) What is meant by crystal field splitting energy? 1
(ii) On the basis of crystal field theory,write the electronic 2
configuration of d4 in terms of t2g and eg in an octahedral field when
(a)Δ0 > P (b) Δ0 < P
24 3
The rate constant of a reaction at 400K and 200K are 0.04 and 0.02 s-1
respectively. Calculate the value of activation energy
(log2 =0.3010; R = 8.314 JK-1mol-1)
25 Below, reactants of some organic name reactions are given. Write the structure of 3
the main product in each and also identify the name reaction.

26 Write mechanism of dehydration of ethanol to yield ethoxyethane 3

27 What happens when D-glucose is treated with the following reagents? 1

1
(i) HI 1
(ii) Bromine water
(iii)HNO3
28 Compound ‘A’ with molecular formula C4H9Br is treated with aq. KOH solution. 3
The rate of this reaction depends upon the concentration of the compound ‘A’
only. When another isomer ‘B’ of this compound was treated with aq. KOH
solution, the rate of reaction was found to be dependent on concentration of
compound and KOH both.
Write down the structural formula of both the compounds ‘A’ and ‘B’.
Out of these two compounds, which one will be optically active

SECTION D
The following questions are case-based questions. Each question has an internal
choice and carries 4 (1+1+2) marks each. Read the passage carefully and answer the

5
questions that follow.
29. Read the given passage and answer the questions that follows.
Negative ion or Neutral molecule which bound to the metal ion by secondary
valency is called as ligand. In a complex, metal ion acts as Lewis acid and
ligand acts as Lewis base. Ligands are classified according to number of electron
pair in them. The ligand which can donate one electron pair to the metal atom is
called unidentate ligand. The ligand which can donate two electron pairs to the
Metal ion is called bidentate ligand. The ligand in which two or more
coordination sites are there is called polydentate ligand. Polydentate ligand forms
cyclic structure with metal ion and form Chelate.
i) Give an example of unidentate neutral ligand. 1
ii) What are Lewis acids and Lewis bases?. 1
iii) How bidentate and Ambidentate ligands are different? Give example. 2
OR
What are chelate ligands? Give an example
2
30 Molar conductivity for weak electrolytes can be obtained from
molar conductivities of strong electrolytes at infinite dilution by doing
algebraic addition. For example, molar conductivity of weak electrolyte like
CH3COOH can be obtained from molar conductivities at infinite dilution of strong
electrolytes like CH3COONa, HCl and NaCl according to Kohlrauch’s law
Λ°mCH3COOH= [Λ°mCH3COO- + Λ°mNa+] + [ Λ°mH ++ Λ°mCl- ]-[ Λ°m Na+ +
Λ°mCl-]
(i)
What is the expression of Λ°m for an electrolyte AmBn? 1
(ii)
Define limiting molar conductivity. 1
(iii)
Calculate Λ°m for AgCl if Λ°m (AgNO3) = 133.4, Λ°m(KCl)=149.9,
Λ°m(KNO3)=144.9 Scm2mol-1
OR
1
Calculate Λ°m for HAc if Λ°m (HCl) = 425.9, Λ°m(NaCl)=126.4,
Λ°m(NaAc)=91.0 Scm2mol-1
2

SECTION E
The following questions are long answer type and carry 5 marks each. All questions

6
 have an internal choice.
31. Give Reasons for the following
(i) Ce4+ in aqueous solution is a good oxidising agent. 1
(ii) Actinoids contraction is greater from element to element than 1
lanthanoid contraction.
(iii) The actinoids exhibit a larger number of oxidation states than 1
the corresponding lanthanoids.
(iv) La3+ and Lu3+do not show any colour in solutions. 2
Chemistry of all the lanthanoids are quite similar

OR
Complete & balance the following reactions: -
1x
a) Cr2O72–+ Fe2++ H+→ 5
b) MnO4– + H+ + C2O42-
c) KMnO4 HEAT
d) MnO4– + H2O+ I-
e) Cr2O72– + OH-→
32. A colourless substance ‘A’ (C H N) is sparingly soluble in water and gives a water
6 7
soluble compound ‘B’ on treating with HCl. On reacting with CHCl3 and 1x5
alcoholic KOH ‘A’ produces an obnoxious smell due to the formation of
compound ‘C’. Reaction of ‘A’ with benzene sulphonyl chloride gives
compound ‘D’ which is soluble in alkali. ‘A’ reacts With NaNO 2 and HCl, to
form compound ‘E’. Identify compounds ‘A’ to ‘E’.
OR
a) Why is benzene diazonium chloride not stored and used immediately
after its preparation? 1
b) Explain why MeNH2 is a stronger base than MeOH? 1
c) What is the role of pyridine in the acylation reaction of amines? 1
d) Give one chemical test to distinguish between Aniline and 1
benzylamine 1
e] Give a suitable reaction to convert aniline to bromobenzene, name the
reaction also.
33. (i) Define the following terms:(a) Azeotrope (b) Osmotic pressure (c) Colligative
properties 3
(ii) Calculate the molarity of 9.8% (w/w) solution of H2SO4 if the density of the 2
solution is 1.02 g mL–1. (Molar mass of H2SO4 = 98 g mol–1)
OR 1
(i) On mixing liquid X and liquid Y, the volume of the resulting solution
1
decreases. What type of deviation from Raoult’s law is shown by the resulting
solution? What change in temperature would you observe after mixing liquids X 3
and Y?
(ii) What happens when we place the blood cell in water (hypotonic solution)?
Give reason.
At 25°C the saturated vapor pressure of water is 3.165 kPa (23.75 mm Hg). Find
the saturated vapor pressure of a 5% aqueous solution of urea (carbamide) at