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NCERT Solutions for class 11 Chemistry | Chemical Equilibrium MCQs

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Free download in PDF Class 11 Chemistry Chapter 7 Chemical Equilibrium Multiple Choice Questions and Answers for Board, JEE, NEET, AIIMS, JIPMER and other competitive exams. MCQ Questions for Class 11 Chemistry with Answers were prepared based on the latest exam pattern. These short solved questions or quizzes are provided by Gkseries./p>

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(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

[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

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

[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

[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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