SET-3

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Q.P. Code 56/3/3
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narjmWu àíZ-nÌ H$moS> >H$mo CÎma-nwpñVH$m Ho$
Roll No. _wI-n¥ð >na Adí` {bIo§ &
Candidates must write the Q.P. Code
on the title page of the answer-book.

agm`Z {dkmZ (g¡ÕmpÝVH$)

CHEMISTRY (Theory)
:3 : 70
Time allowed : 3 hours Maximum Marks : 70

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àíZ-nÌ _| Xm{hZo hmW H$s Amoa {XE JE àíZ-nÌ H$moS> H$mo narjmWu CÎma-nwpñVH$m Ho$ _wI-n¥ð>
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H¥$n`m Om±M H$a b| {H$ Bg àíZ-nÌ _| >35 àíZ h¢ &
H¥$n`m àíZ H$m CÎma {bIZm ewê$ H$aZo go nhbo, CÎma-nwpñVH$m _| àíZ H$m H«$_m§H$
Adí` {bI| &
Bg àíZ-nÌ 15 {_ZQ >H$m g_` {X`m J`m h¡ & àíZ-nÌ H$m {dVaU
10.15 ~Oo {H$`m OmEJm & 10.15 ~Oo go 10.30 ~Oo VH$ N>mÌ Ho$db àíZ-nÌ H$mo
-nwpñVH$m na H$moB© CÎma Zht {bI|Jo &
Please check that this question paper contains 23 printed pages.
Q.P. Code given on the right hand side of the question paper should be
written on the title page of the answer-book by the candidate.
Please check that this question paper contains 35 questions.
Please write down the serial number of the question in the
answer-book before attempting it.
15 minute time has been allotted to read this question paper. The question
paper will be distributed at 10.15 a.m. From 10.15 a.m. to 10.30 a.m.,
the students will read the question paper only and will not write any
answer on the answer-book during this period.
*
56/3/3 1 P.T.O.
General Instructions :
Read the following instructions carefully and strictly follow them :
(i) This question paper contains 35 questions. All questions are compulsory.
(ii) This question paper is divided into five Sections A, B, C, D and E.
(iii) In Section A Questions no. 1 to 18 are multiple choice (MCQ) type questions,
carrying 1 mark each.
(iv) In Section B Questions no. 19 to 25 very short answer (VSA) type questions,
carrying 2 marks each.
(v) In Section C Questions no. 26 to 30 are short answer (SA) type questions,
carrying 3 marks each.
(vi) In Section D Questions no. 31 and 32 are case-based questions carrying
4 marks each.
(vii) In Section E Questions no. 33 to 35 are long answer (LA) type questions
carrying 5 marks each.
(viii) There is no overall choice. However, an internal choice has been provided in
2 questions in Section B, 2 questions in Section C, 2 questions in Section D and
2 questions in Section E.
(ix) Use of calculators is not allowed.

SECTION A

Questions no. 1 to 18 are Multiple Choice (MCQ) type Questions, carrying

1 mark each. 18 1=18

1. Kohlrausch gave the following relation for strong electrolyte :

= A C

Which of the following equality holds true ?

(a) = as C A
(b) = as C 0
(c) = as C
(d) = as C 1
56/3/3 3 P.T.O.
2. Which of the following belongs to the class of alkyl halides ?
(a) CH2 = CH Cl

(b) CH2 = CH CH2 CH2 Cl

(c) CH2 = CH CH CH3

|
Cl
(d) CH C CH2 Cl

3. An azeotropic mixture of two liquids has a boiling point higher than

either of the two liquids when it :
(a)
(b)
(c)
(d) .

4. For the conversion of propene into 1-propanol, which of the following

reagents and conditions should be used ?
(a) Conc. H2SO4 ; H2O and heat
(b) B2H6 ; H2O2 / OH
(c) Dilute H2SO4
+
(d) H2O / H

5. Which of the following reagents would one choose to transform CH3COCl

into acetone ?
(a) (CH3)2Cd (b) CH3MgBr
(c) CH3Cl (d) (CH3O)2Mg

6. The reaction of ammonia with a large excess of methyl chloride will yield
mainly :
(a) methylamine
(b) dimethylamine
(c) tetramethylammonium chloride
(d) trimethylamine
56/3/3 5 P.T.O.
7. In the ring structure of glucose, the anomeric carbon is :
(a) C-2 (b) C-3
(c) C-4 (d) C-1

8. Deficiency of Vitamin B causes :

(a) rickets
(b) muscular weakness
(c) scurvy
(d) beri-beri

9. The cathode reaction during the charging of a lead storage battery leads
to the :
(a) formation of PbSO4
2+ 4+
(b) reduction of Pb to Pb
(c) formation of PbO2 and Pb
(d) deposition of Pb at the anode

10. Which one of the following pairs will not form an ideal solution ?
(a) Benzene and Toluene
(b) Nitric acid and Water
(c) Hexane and Heptane
(d) Ethyl chloride and Ethyl bromide

11. The half-life of a reaction is doubled when the initial concentration is

doubled. The order of the reaction is :
(a) 1 (b) 2
(c) 4 (d) 0

12. Which of the following ions has the maximum number of unpaired
d-electrons ?
3+
(a) Fe3+ (b) V
(c) Ti3+ (d) Sc3+
[Atomic number : Fe = 26, V = 23, Ti = 22, Sc = 21]
56/3/3 7 P.T.O.
13. Which of the following is a polydentate ligand ?
(a) NH3
(b) H2N CH2 CH2 NH2
(c) EDTA4
2
(d) C2O4

14. Which of the following coordination compounds exhibits linkage

isomerism ?
(a) [Co(NH3)3Cl3]
(b) [Co(NH3)5(CO3)]Cl
(c) [Co(NH3)5NO2](NO3)2
(d) [Co(en)3]Cl3

For Questions number 15 to 18, two statements are given one labelled as
Assertion (A) and the other labelled as Reason (R). Select the correct
answer to these questions from the codes (a), (b), (c) and (d) as given below.
(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the
correct explanation of the Assertion (A).
(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not
the correct explanation of the Assertion (A).
(c) Assertion (A) is true, but Reason (R) is false.
(d) Assertion (A) is false, but Reason (R) is true.

15. Assertion (A) : Nucleophilic substitution of iodoethane is easier than

chloroethane.
Reason (R): Bond energy of C Cl bond is less than C I bond.

16. Assertion (A) : Order and molecularity of a reaction are always same.

Reason (R) : Complex reactions involve a sequence of elementary

reactions and the slowest step is rate determining.

56/3/3 9 P.T.O.
17. Assertion (A): Zinc is not regarded as a transition element.
Reason (R): In zinc, 3d orbitals are completely filled in its ground
state as well as in its oxidised state.

18. Assertion (A) : Fe2+ acts as a reducing agent.

Reason (R) : Fe3+ state is stable due to 3d5 configuration.

SECTION B

19. Give the structures and IUPAC name of the products expected from the
following reactions : 2 1=2

(a) Reaction of methanal with MgBr followed by hydrolysis.

(b) Reaction of phenol with Br2 (aq).

20. The half-life of a first order reaction is 60 minutes. How long will it take
to consume 90% of the reactant ? 2
[Given : log 2 = 0 3010, log 3 = 0 4771, log 10 = 1]

21. Write the chemical equation involved in the following reactions : 2

(a) Carbylamine reaction
(b) Gabriel phthalimide synthesis

22.
ethanol and acetone ? Give reason. 2

23. (a) (i) How are carbohydrates stored in animal body ? Mention any
one organ where they are present.
(ii) What is the basic structural difference between starch and
cellulose ? 2
OR
(b) Differentiate between : 2
(i) Peptide linkage and Glycosidic linkage
(ii) Nucleoside and Nucleotide

56/3/3 11 P.T.O.
24. (a) Define fuel cell and write its two advantages. 2
OR
(b) Using E values of X and Y given below, predict which is better for
coating the surface of Iron to prevent corrosion and why ? 2
Given : E 2 = 2 36 V
X /X
E 2 = 0 14 V
Y /Y
E = 0 44 V
Fe 2 / Fe

25. Give reasons : 2 1=2

(a) Formic acid is a stronger acid than acetic acid.
(b) Alpha ( )-Hydrogens of aldehydes and ketones are acidic.
SECTION C

26. The rate of a reaction doubles when temperature changes from 27 C to

37 C. Calculate energy of activation for the reaction.
(R = 8 314 J K 1 mol 1) 3
(Given : log 2 = 0 3010, log 3 = 0 4771, log 4 = 0 6021)

27. Write the structure of product when D-Glucose reacts with the following :
(any three) 3 1=3
(a) HI
(b) Conc. HNO3
(c) Br2 water
(d) HCN

1
28. (a) Write the structures of A, B and C in the following reactions : 2 1 =3
2
NH 3 Br2 NaOH
(i) CO COOH A B

NaNO2 HCl
C
0C
KCN LiAlH 4 HNO 2
(ii) CH3CH2Br A B C
0C
OR

56/3/3 13 P.T.O.
 (b) How will you convert the following : 3 1=3

(i) Aniline to p-bromoaniline

(ii) Ethanoic acid to methanamine

(iii) Butanenitrile to 1-aminobutane

29. 0 3 g of acetic acid (M = 60 g mol 1) dissolved in 30 g of benzene shows a

depression in freezing point equal to 0 45 C. Calculate the percentage
association of acid if it forms a dimer in the solution. 3
1
(Given : Kf for benzene = 5 12 K kg mol )

30. (a) Write the mechanism of the following reaction :

H
CH3 CH2 OH CH2 = CH2 + H2O
443 K
(b) Write the equation of the reaction for the preparation of phenol
from cumene. 3

SECTION D

The following questions are case-based questions. Read the case carefully and
answer the questions that follow.

31. The polarity of C X bond of alkyl halides is responsible for their

nucleophilic substitution, elimination and their reaction with metal atoms
to form organometallic compounds. Alkyl halides are prepared by the free
radical halogenation of alkanes, addition of halogen acids to alkenes,
replacement of OH group of alcohols with halogens using phosphorus
halides, thionyl chloride or halogen acids. Aryl halides are prepared by
electrophilic substitution of arenes. Nucleophilic substitution reactions
are categorised into SN1 and SN2 on the basis of their kinetic properties.
Chirality has a profound role in understanding the SN1 and SN2

mechanism.
56/3/3 15 P.T.O.
 Answer the following questions :
(i) What happens when bromobenzene is treated with Mg in the
presence of dry ether ? 1
(ii) Which compound in each of the following pairs will react
faster in SN1 reaction with OH ? 1
(1) CH2 = CH CH2 Cl or CH3 CH2 CH2 Cl
(2) (CH3)3C Cl or CH3Cl
(iii) Write the equations for the preparation of 1-iodobutane from
(1) 1-chlorobutane
(2) but-1-ene. 2×1=2

OR
(iii) Write the structure of the major products in each of the
following reactions : 2×1=2
Ethanol
(1) CH3 CH CH3 + KOH
| heat
Br

Anhyd. AlCl 3
(2) + CH3COCl

32. Coordination compounds are widely present in the minerals, plant and
animal worlds and are known to play many important functions in the
area of analytical chemistry, metallurgy, biological systems and medicine.

(primary and secondary), by a metal atom/ion in a coordination compound.

He predicted the geometrical shapes of a large number of coordination
entities using the property of isomerism. The Valence Bond Theory (VBT)
explains the formation, magnetic behaviour and geometrical shapes of
coordination compounds. It, however, fails to describe the optical
properties of these compounds. The Crystal Field Theory (CFT) explains
the effect of different crystal fields (provided by the ligands taken as point
charges) on the degeneracy of d-orbital energies of the central metal
atom/ion.

56/3/3 17 P.T.O.
 Answer the following questions :
(i) When a coordination compound NiCl2 . 6H2O is mixed with
AgNO3 solution, 2 moles of AgCl are precipitated per mole of

the compound. Write the structural formula of the complex

and secondary valency for Nickel ion. 1
(ii) Write the IUPAC name of the ionisation isomer of
[Co(NH3)5(SO4)]Cl. 1

(iii) Using Valence Bond Theory, predict the geometry and

magnetic nature of :

(1) [Ni(CO)4]

(2) [Fe(CN)6]3
[Atomic number : Ni = 28, Fe = 26] 2×1=2
OR
(iii) Give reasons : 2×1=2

(1) Low spin tetrahedral complexes are not formed.

3+
(2) [Co(NH3)6] is an inner orbital complex whereas
2+
[Ni(NH3)6] is an outer orbital complex.
[Atomic number : Co = 27, Ni = 28]

SECTION E

33. (a) (i) An organic compound (X) having molecular formula C5H10O
can show various properties depending on its structures.
Draw each of the structures if it
(1) gives positive iodoform test.

(2)
(3) has a chiral carbon.

56/3/3 19 P.T.O.
 (ii) Write the reaction involved in the following :

(1) Wolff-Kishner reduction

(2) Hell-Volhard-Zelinsky reaction 3+2=5

OR

(b) (i) How can you convert each of the following compounds to
Benzoic acid ?

(1) Acetophenone

(2) Ethylbenzene

(3) Bromobenzene

(ii) Arrange the following compounds in increasing order of their

property as indicated :

(1) O2N CH2 COOH, F CH2 COOH, CN CH2COOH

(Acidic character)

(2) Ethanal, Propanal, Butanone, Propanone

(Reactivity in nucleophilic addition reactions) 3+2=5

34. (a) Calculate the emf of the following cell at 25 C :

+
Zn (s) Zn2+ (0·1 M) H (0·01 M) H2 (g) (1 bar), Pt (s)

[Given : E = 0·76 V, E = 0·00 V, log 10 = 1]

Zn 2 / Zn H / H2

(b) State Kohlrausch law of independent migration of ions. Why does

the conductivity of a solution decrease with dilution ? 3+2=5

56/3/3 21 P.T.O.
35. (a) (i) Account for the following :

(1) Transition metals form complex compounds.

(2) The E value for manganese is highly negative
Mn 2 / Mn
whereas E is highly positive.
Mn 3 / Mn 2

(3) Cu+ ion is unstable in aqueous solution.

(ii) Write the equations involved in the preparation of KMnO4

from Pyrolusite ore (MnO2). 3+2=5

OR

(b) (i) Identify the following :

(1) Transition metal of 3d series that exhibits only one

oxidation state.

(2) Transition metal of 3d series that acts as a strong

reducing agent in +2 oxidation state in aqueous solution.

(ii) Complete and balance the following equations :

2 +
(1) Cr2O7 + 14H + 6Fe2+

heat
(2) KMnO4

(iii) What is Misch metal ? Write its one use. 2+2+1=5

56/3/3 23 P.T.O.