1. The reaction quotient (Q) for the reaction N2 (g) + 3H2(g) 
2NH3(g) is given by Q = [NH3]2/[N2][H2]3. The reaction will proceed from right to left if ..... (where Kc is the equilibrium constant)
1) Q = Kc 2) Q < Kc 3) Q > Kc 4) Q = 0
2. Three reactions involving H2PO4- are given below
i) H3PO4 + H2O → H3O+ + H2PO4
ii) H2PO4 + H2O → HPO22- + H3O+
iii) H2PO4- + OH- → H3PO4 + O2- In which of the above does H2PO4- act as an acid?
1) i only 2) ii only 3) i, ii 4) iii only
3. The Ksp for Cr(OH)3 is 1.6 × 10-30. The molar solubility of this compound in water is... 
4. How many litres of water must be added to 1 litre of an aqueous solution of HCl with a pH of 1 to create an aqueous solution with pH of 2?
1) 0.1 L 2) 0.9 L 3) 2.0 L 4) 9.0 L
5. The equilibrium constant Kp for following reaction
MgCO3(s) MgO(s) + CO2(g) 
6. Which of the following fluoro compounds is most likely to behave as a Lewis base?
1) BF3 2) PF3 3) CF4 4) SiF4
7. If the concentration of OH- ions in the reaction Fe(OH)3(s) Fe3+(aq) + 3OH-(aq) is decreased by 1/4 times, the equilibrium concentration of Fe3+ will increase by ...
1) 4 times 2) 8 times 3) 16 times 4) 64 times
8. For the reaction SO2(g) + 1/2 O2(g) SO3(g), if Kp = Kc(RT)x where the symbols have usual meaning then the value of x is (assuming ideality)
1) -1 2) -1/2 3) 1/2 4) 1.0
11. When rain is accompanied by a thunderstorm the collected rain water will have a pH value
1) Slightly lower than that of rain water without thunderstorm
2) Slightly higher than that when the thunderstorm is not there
3) Uninfluenced by occurrence of thunderstorm
4) Which depends on the amount of dust in air
12. Change in volume of the system does not alter the number of moles in which of the following equilibria?
1) N2(g) + O2(g) 2NO(g)
2) PCl5 (g) PCl3 (g) + Cl2(g)
3) N2(g) + 3H2(g) 2NH3(g)
4) 2 SO2(g)+ O2(g) 2SO3(g)
13. What is the equilibrium expression for the reaction
P4(g) + 5O2(g) P4O10(s)?
14. Which of the following is an irreversible reaction?
1) PCl5 → PCl3 + Cl2 2) 2SO2 + O2 → 2SO3
3) N2 + 3H2 → 2NH3 4) 2KClO3 → 2KCl + 3O2
15. Which of the following is not a conjugate acid - base pair?
1) HPO32- . PO33- 2) H2PO4 - . HPO42-
3) H2PO4- . PO33- 4) H2PO4- . H3PO4
16. In aqueous solution, HCl and HNO3 are equally strong . This is because
1) Their basicities are same
2) Both are oxyacids of non metals
3) Both have lower molecular weights
4) Levelling effect of water
17. The conjugate base of hydrazoic acid is
1) N3- 2) N3- 3) NH2- 4) NH2-
18. If K1 and K2 are the respective equilibrium constants for the two reactions,
XeF6(g) + H2O(g) → XeOF4(g) + 2HF(g)
XeO4(g) + XeF6(g) → XeOF4(g) + XeO3F2, the equilibrium constant of the reaction.
XeO4(g) + 2HF(g) → XeO3F2(g) + H2O(g) will be
1) K1/K2 2) K1. K2 3) K1/(K2)2 4) K2/K1
19. The pH of a solution of H2O2 is 6.0 some Cl2 gas is bubbled into this solution. Which of the following is correct?
1) The pH of the resultant solution becomes 8
|2) H2 gas is liberated
3) The pH of the resultant solution becomes less than 6.0 and O2 gas is liberated
4) Cl2O is formed in the resultant solution
20. The least soluble compound of the following?
1) CsCl (Ksp = 10-12) 2) Hgs (Ksp = 1 × 10-52)
3) PbCl2 (Ksp = 1.7 × 10-5) 4) ZnS (Ksp = 1.2 × 10-23)
ANSWERS: 1-1; 2-2; 3-4; 4-4; 5-1; 6-2; 7-4; 8-2; 9-3; 10-3; 11-1; 12-1; 13-4; 14-4; 15-3; 16-4; 17-2; 18-4; 19-3.
