NCERT Solutions for class 11 Chemistry | Chemical Equilibrium MCQs

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Questions
1 Find the conjugate acid of NH2–
A NH3
B NH4OH
C NH4+
D NH2–

Answer:NH3
2 On increasing the concentration of reactants in a reversible reaction, then equilibrium constant will
A depend on the concentration
B increase
C unchanged
D decrease

Answer:unchanged
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3 Find the increase in equilibrium concentration of Fe3+ ions if OH– ions concentration decreases to 1/4th in the following reaction

Equilibrium

A 8 times
B 16 times
C 4 times
D 64 times

Answer:64 times
4 What will be the pH of a buffer solution having an equal concentration of B– and HB (Kb = 10-10 for B–)
A 7
B 4
C 10
D 6

Answer:4
5 The equilibrium constant is 278 for the reaction Eqilibrium

at the same temperature, what will be the equilibrium constant for the following reaction?

Eqilibrium
A 6 x 10-2
B 1.8 x 10-3
C 1.3 x 10-5
D 3.6 x 10-5

Answer:6 x 10-2
6 Highest pH will be recorded for which of the following solutions if they are equimolar
A AlCl3
B BaCl2
C BeCl2
D LiCl

Answer:BaCl2
7 Find the equilibrium constant of the reaction

If the equilibrium constant for the following reactions are given

Eqilibrium

A K2K3/K1
B K1K33/K2
C K2K33/K1
D K23K3/K1

Answer:K2K33/K1
8 In 0.10 M aqueous solution of pyridine (C5H5N), find the percentage of pyridine that forms pyridinium ion (C5H5N+H) (Kb for C5H5N = 1.7 x 10-9 )
A 1.6%
B 0.77%
C 0.0060%
D 0.013%

Answer:0.013%
9 Which of the following aqueous solution will be the best conductor of electricity?
A NH3
B CH3COOH
C HCl
D C6H12O6

Answer:HCl
10 Find the pH of a solution when 0.01 M HCl and 0.1 M NaOH are mixed in equal volumes
A 12.65
B 1.04
C 7.0
D 2.0

Answer:12.65
11 At a particular temperature and atmospheric pressure, the solid and liquid phases of a pure substance can exist in equilibrium. Which of the following Does the term define this temperature?
A Normal melting point
B Equilibrium temperature
C Boiling point
D Freezing point

Answer:A, D
12 For the reaction N2O4 (g) ⇌ 2NO2 (g), the value of K is 50 at 400 K and 1700 at 500 K. Which of the following options is correct?
A The reaction is endothermic
B The reaction is exothermic
C If NO2 (g) and N2O4 (g) are mixed at 400 K at partial pressures 20 bar and 2 bar respectively, more N2O4 (g) will be formed.
D The entropy of the system increases.

Answer:A, C, D
13 In which of the following reactions, the equilibrium remains unaffected on addition of small amount of argon at constant volume?
A H2 (g) + I2 (g) ⇌ 2HI (g)
B PCl5 (g) ⇌ PCl3 (g) + Cl2 (g)
C N2 (g) + 3H2 (g) ⇌ 2NH3 (g)
D The equilibrium will remain unaffected in all the three cases.

Answer:The equilibrium will remain unaffected in all the three cases.
14 At 500 K, the equilibrium constant, 6Kc, for the following reaction is 5.

1/2 H2 (g) +1/2 I2 (g) ⇌ HI (g)

What would be the equilibrium constant Kc for the reaction 2HI (g) ⇌ H2 (g) + I2 (g)

A 0.04
B 0.4
C 25
D 2.5

Answer:0.04
15 What will be the correct order of vapour pressure of water, acetone and ether at 30°C. Given that among these compounds, water has a maximum boiling Do point and ether have a minimum boiling point?
A Water < ether < acetone
B Water < acetone < ether
C Ether < acetone < water
D Acetone < ether < water

Answer:Water < acetone < ether
16 On increasing the pressure, in which direction will the gas-phase reaction proceed to re-establish equilibrium, is predicted by applying Le Chatelier’s principle. Consider the reaction.

N2 (g) + 3H2 (g) ⇌ 2NH3 (g)

Which of the following is correct, if the total pressure at which the equilibrium is established, is increased without changing the temperature?

A K will remain the same
B K will decrease
C K will increase
D K will increase initially and decrease when pressure is very high

Answer:K will remain the same
17 Which of the following options will be correct for the stage of half completion of the reaction A ⇌ B
A ∆Gᶱ= 0
B ∆Gᶱ > 0
C ∆Gᶱ< 0
D ∆Gᶱ= –RT ln2.

Answer:∆Gᶱ= 0
18 Ka for CH3COOH is 1.8 × 10–5 and Kb for NH4OH is 1.8 × 10–5. The pH of ammonium acetate will be
A 7.005
B 4.75
C 7.0
D Between 6 and 7

Answer: 7.0
19 What will be the value of pH of 0.01 mol dm–3 CH3COOH (Ka = 1.74 × 10–5 )?
A 3.4
B 3.6
C 3.9
D 3.0

Answer:3.4
20 In which of the following solvents is silver chloride most soluble?
A 0.1 mol dm–3 AgNO3 solution
B 0.1 mol dm–3 HCl solution
C H2O
D Aqueous ammonia

Answer:Aqueous ammonia

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