SET-1

Series HFG1E/1 àíZ-nÌ H$moS>

Q.P. Code 56/1/1
amob Z§.
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

H¥$n`m Om±M H$a b| {H$ Bg àíZ-nÌ _o§ _w{ÐV n¥ð> 19 h¢ &

àíZ-nÌ _| Xm{hZo hmW H$s Amoa {XE JE àíZ-nÌ H$moS> H$mo narjmWu CÎma-nwpñVH$m Ho$ _wI-n¥ð>
na {bI| &
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 19 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.
*
56/1/1 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. The colligative property used for the determination of molar mass of

polymers and proteins is :
(a) Osmotic pressure
(b) Depression in freezing point
(c) Relative lowering in vapour pressure
(d) Elevation is boiling point

2. Low concentration of oxygen in the blood and tissues of people living at

high altitude is due to :
(a) high atmospheric pressure
(b) low temperature
(c) low atmospheric pressure
(d) both low temperature and high atmospheric pressure

56/1/1 3 P.T.O.
3. The correct cell to represent the following reaction is :
Zn + 2Ag+ Zn2+ + 2Ag
(a) 2Ag Ag+ Zn Zn2+
(b) Ag+ Ag Zn2+ Zn
(c) Ag Ag+ Zn Zn2+
(d) Zn Zn2+ Ag+ Ag

4. G and Ecell for a spontaneous reaction will be :

(a) positive, negative (b) negative, negative
(c) negative, positive (d) positive, positive
5. Which of the following is affected by catalyst ?
(a) H (b) G
(c) Ea (d) S
6. The order of the reaction
h
H2 (g) + Cl2 (g) 2HCl (g) is :
(a) 2 (b) 1
(c) 0 (d) 3
7. The most common and stable oxidation state of a Lanthanoid is :
(a) +2 (b) +3
(c) +4 (d) +6
8. The compounds [Co(SO4) (NH3)5] Br and [Co(Br) (NH3)5] SO4 represent :

(a) optical isomerism (b) linkage isomerism

(c) ionisation isomerism (d) coordination isomerism

9. The synthesis of alkyl fluoride is best obtained from :

(a) Free radicals (b) Swartz reaction
(c) Sandmeyer reaction (d) Finkelstein reaction

ZnCl2
10. In the reaction R OH + HCl RCl + H2O, what is the correct
order of reactivity of alcohol ?

(a) 1 <2 <3 (b) 1 >3 >2

(c) 1 >2 >3 (d) 3 >1 >2

56/1/1 5 P.T.O.
11. CH3CONH2 on reaction with NaOH and Br2 in alcoholic medium gives :
(a) CH3COONa (b) CH3NH2
(c) CH3CH2Br (d) CH3CH2NH2

12. Which of the following is least basic ?

(a) (CH3)2NH (b) NH3

(c) NH2 (d) (CH3)3N

13. The glycosidic linkage involved in linking the glucose units in amylase
part of starch is :
(a) C1 C6 linkage (b) C1 C6 linkage
(c) C1 C4 linkage (d) C1 C4 linkage

14. An -helix is a structural feature of :

(a) Sucrose (b) Starch
(c) Polypeptides (d) Nucleotides

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) : NH2 group is o- and p-directing in electrophilic

substitution reactions.
Reason (R) : Aniline cannot undergo Friedel-Crafts reaction.

56/1/1 7 P.T.O.
16. Assertion (A) : Acetylation of aniline gives a monosubstituted product.
Reason (R) : Activating effect of NHCOCH3 group is more than that
of amino group.
17. Assertion (A) : The molecularity of the reaction H2 + Br2 2HBr
appears to be 2.
Reason (R) : Two molecules of the reactants are involved in the given
elementary reaction.
18. Assertion (A) : Low spin tetrahedral complexes are rarely observed.
Reason (R) : Crystal field splitting energy is less than pairing energy
for tetrahedral complexes.

SECTION B

19. 2

20. (a) On diluting two el m

5 times. Which of the two
electrolytes is strong ? Justify your answer graphically. 2
OR
1
(b) The electrical resistance of a column of 0 05 mol L NaOH solution
3
of diameter 1 cm and length 50 cm is 5 55 10 ohm. Calculate the
conductivity. 2

21. Complete the following equations : 1+1=2

+
(a) 2MnO4 + 5NO2 + 6H
2 +
(b) Cr2O7 + 14H + 6e
PCl 5 AgCN
22. (a) CH3 CH CH3
|
OH
ethanol HBr
(b) CH3CH2CH2Cl + KOH
n the above reactions. 1+1=2

56/1/1 9 P.T.O.
23. (a) Account for the following : 1+1=2
(i) Phenol is a stronger acid than an alcohol.
(ii) The boiling point of alcohols decreases with increase in
branching of alkyl chain.
OR

(b) (i) Write the mechanism of the following reaction :

H
CH3CH2OH CH2 = CH2 + H2O
443 K
(ii) Write the equation involved in Reimer-Tiemann reaction. 1+1=2

24. Explain briefly : 1+1=2

(a) Carbylamine reaction
(b) Gabriel phthalimide synthesis

25. (a) Write chemical reaction to show that open structure of D-glucose
contains the straight chain.
(b) What type of linkage is responsible for the formation of protein ? 2

SECTION C

26. (a) Differentiate between Ideal solution and Non-ideal solution.

(b) 30 g of urea is dissolved in 846 g of water. Calculate the vapour
pressure of water for this solution if vapour pressure of pure water
at 298 K is 23 8 mm Hg. 3

27. Write main product formed when : 3 1=3

(a) Methyl chloride is treated with NaI/Acetone.
(b) 2,4,6-trinitrochlorobenzene is subjected to hydrolysis.
(c) n-Butyl chloride is treated with alcoholic KOH.

28. How do you convert the following : (Any three) 3 1=3

(a) Phenol to picric acid
(b) Propanone to 2-Methylpropan-2-ol
(c) Phenol to anisole
(d) Propene to Propan-1-ol

56/1/1 11 P.T.O.
29. (a) Explain why : 3 1=3

(i) Carboxyl group in benzoic acid is meta directing.

(ii) Sodium bisulphite is used for the purification of aldehydes and

ketones.

(iii) Carboxylic acids do not give characteristic reactions of

carbonyl group.

OR

(b) 3H8O on

I2 / NaOH. Deduce the structures of A, B and C. 3

30. (a) What are the hydrolysis products of (i) Lactose, (ii) Maltose ?

(b) Give the basic structural difference between starch and cellulose. 2+1=3

SECTION D

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

31. The rate of reaction is concerned with decrease in concentration of

reactants or increase in the concentration of products per unit time. It can

be expressed as instantaneous rate at a particular instant of time and

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.

56/1/1 13 P.T.O.
 (i) What is average rate of reaction ? 1

(ii) Write two factors that affect the rate of reaction. 1

(iii) (1) What happens to rate of reaction for zero order reaction ?

(2) What is the unit of k for zero order reaction ? 2 1=2

OR

(iii) (1) For a reaction P + 2Q Products

Rate = k[P]1/2 [Q]1. What is the order of the reaction ?

(2) Define pseudo first order reaction with an example. 2 1=2

32. In coordination compounds, metals show two types of linkages, primary

and secondary. Primary valencies are ionisable and are satisfied by
negatively charged ions. Secondary valencies are non-ionisable and are
satisfied by neutral or negative ions having lone pair of electrons. Primary
valencies are non-directional while secondary valencies decide the shape
of the complexes.

(i) If PtCl2 . 2NH3 does not react with AgNO3, what will be its
formula ? 1

3+
(ii) What is the secondary valency of [Co(en)3] ? 1

(iii) (1) Write the formula of Iron(III)hexacyanidoferrate(II).

(2) Write the IUPAC name of [Co(NH3)5Cl] Cl2. 2 1=2

OR

2
(iii) Write the hybridization and magnetic behaviour of [Ni(CN) 4] . 2
[Atomic number : Ni = 28]

56/1/1 15 P.T.O.
 SECTION E

33. (a) (i)

Write an expression for the limiting molar conductivity of

(ii) Calculate the maximum work and log Kc for the given
reaction at 298 K :
2+
Ni (s) + 2Ag+ (aq) Ni (aq) + 2Ag (s)

Given : E = 0·25 V, E = + 0·80 V

Ni 2 / Ni Ag / Ag
1
1 F = 96500 C mol 2+3=5
OR

(b) (i) law of electrolysis. How much charge, in

terms of Faraday, is required for the reduction of 1 mol Cu 2+
to Cu ?

(ii) Calculate emf of the following cell at 298 K for

Mg (s) Mg2+ (0 1 M) Cu2+ (0 1 M) Cu (s)
1
[ E cell = + 2 71 V, 1 F = 96500 C mol , log 10 = 1] 2+3=5

34. Assign reason for each of the following : 5 1=5

(i) Manganese exhibits the highest oxidation state of +7 among the 3d

series of transition elements.

(ii) Transition metals and their compounds are generally found to be

good catalysts in chemical reactions.

(iii) Cr2+ is reducing in nature while with the same d-orbital

configuration (d4) Mn3+ is an oxidising agent.

(iv) Zn has lowest enthalpy of atomization.

(v) Cu+ is unstable in an aqueous solution.

56/1/1 17 P.T.O.
35. (a) (i) Carry out the following conversions :
(1) Ethanal to But-2-en-1-al

(2) Propanoic acid to 2-chloropropanoic acid

(ii) An alkene with molecular formula C5H10 on ozonolysis gives

positive Fehling test and also reacts with iodine and NaOH

2+3=5
OR

(b) (i) Distinguish with a suitable chemical test :

(1) CH3COCH2CH3 and CH3CH2CH2CHO

(2) Ethanal and Ethanoic acid

(ii) Write the structure of oxime of acetone.

(iii) Identify A to D. 2+1+2=5

PCl5 H2 / Pd BaSO4 (i) CH3 / MgBr
CH3COOH A B C
(ii) H3O+

LiAlH4

56/1/1 19 P.T.O.