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Page 2

QUESTION BANK
CHEMISTRY

Gujarat Secondary and Higher
Secondary Education Board,

Gandhinagar

Price : ̀ 70.00
Published by :

Secretary
Gujarat Secondary and Higher Secondary Education Board,

Gandhinagar

I

Copyright of this book is reserved by Gujarat Secondary and Higher Secondary Education
Board, Gandhinagar. No reproduction of this book in whole or in part, or in any form is
permitted without written permission of the Secretary, Gujarat Secondary and Higher

Secondary Education Board, Gandhinagar.

Page 161

156

21. A vessel contains
2CO at 1000k temperature with a pressure 0.5 atm.some of 2CO is converted in

to CO on addition of graphite. If total pressure at equilibrium is 0.8 atm the value of KP is:
(a) 3 atm (b) 0.3 atm (c) 0.18 atm (d) 1.8 atm

22. Three reactions involving 2 4H PO are given below..

(i) 3 4 2 3 2 4H PO H O H O H PO

(ii) - 22 4 2 4 3H PO H O HPO H O

(iii) - - 22 4 3 4H PO OH H PO O

In which of the above does -42POH act as an acid.
(a) (i) only (b) (ii) only (c) (i) and (ii) (d) (iii) only

23. For the reaction

2(g) (g) 2(g)2NO 2NO O
6Kc 1.8 10 at 184 c R 0.0831 KJ/mol.K

When KP and KC are compared at C184 it is found that :
(a) whether Kp is greater than less than or equal to Kc depends upon the total gas pressure
(b) Kp=Kc
(c) Kp<Kc
(d) Kp>Kc

24. Water is a
(a) Protophobic solvent (b) Protophilic solvent
(c) Amphiprotic solvent (d) Aprotic acid

25. Ammonium ion is
(a) Conjugate acid (b) Conjugate base
(c) Neither an acidnor a base (d) both an acid and a base.

26. Species acting both as bronsted acid and a base is
(a) 4HSO (b) 32CONa (c) 3NH (d)

-OH

27. A solution of an acid has 70.4PH find out the concentration of . wOH pK 14

(a) M105 10 (b) M104 10 (c) M102 5 (d) M109 4

28. The conjugate base of 2 4H PO is

(a) 34PO (b) 4HPO (c) 43POH (d)
2

4HPO
29. What is the conjugate base of OH ?

(a) 2O (b) OH2 (c) O (d) 2O
30. An example for lewis acid is

(a) Ammonia (b) Aluminium chloride
(c) Pyridine (d) Amines.

31. Which of the following molecule act as a lewis acid ?
(a) OCH 23 (b) PCH 33 (c) NCH 33 (d) BCH 33

Page 162

157

32. In a given system, water and ice are in equilibrium. If pressure is applied to the above system, then,
(a) More ice is formed (b) Amount of ice and water will remain same
(c) More ice is melted (d) Either (a) or (c)

33. In 2 22 HI H I H 0 the forward reaction is affected by change in
(a) Catalyst (b) Pressure (c) Volume (d) Temp

34. In which case KP is less than KC (?)
(a) 5(g) 3(g) 2(g)PCl PCl Cl (b) 2(g) 2(g) (g)H Cl 2HCl

(c) 2 2 3(g)2 SO O 2SO (d) all of these.

35. If 1K and 2K are respective equlibrium constants for two reaction,

6(g) 2 (g) 4(g) (g)XeF H O XeOF 2HF

4(g) 6 4(g) 3 2(g)XeF XeF XeOF XeO F
the equilibrium constant for the reaction

4(g) (g) 3 2(g) 2 (g)XeF 2HF XeO F H O will be

(a) 21 KK (b) 12 KK (c) 12 K/K (d) 21 K/K
36. For a homologous reaction,

3 2 24 NH 5O 4 NO 6H O
the dimensions of equilibrium constant KC is
(a) 10.conc (b) 1.conc (c) 1.conc (d) It is dimensionless

37. For a reversible reaction, if the concetration of the reactants are doubled, the equilibrium constant
will be
(a) The same (b) Halved (c) Doubled (d) One fourth

38. The molar solubility of a sparingly soluble salt 4AB is 's' lit
mol The corrosponding solubility product

KSP is given in terms of KSP by the relation

(a)
1

4

SPKS 128 (b)
1

4

SPS 128 K (c)
1

5

SPS 256 K (d)
1

5

SPS K / 256

39. The solubility product of a salt having general formula MX2 in water is
12104 The concentration

of 2M ions in an aqueous solution of the salt is:

(a) M104.0 10 (b) M101.6 4 (c) M101.0 4 (d) M102.0 6

40. HP of 0.005 M calcium acetate ( 74.4COOHCHofP 3
Ka ) is

(a) 7.04 (b) 9.37 (c) 9.26 (d) 8.37
41. One of the following equilibria is not affected by change in volume of the flask.

(a) s(g) 3(g) 2(g)PCl PCl Cl (b) 2(g) 2(g) 3(g)N 3H 2NH

(c) 2(g) 2(g) (g)N O 2NO (d) 2 2(g) 2(g) 2(g)SO Cl SO Cl

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