Class 11 Chemistry – Equilibrium MCQs

Q1. 0.10M CH₃COOH is 1.34% ionised, calculate its K :

1. 1.8 × 10^-5
2. 1.8 × 10^-4
3. 5 × 10^-4
4. 4 × 10^-5

Q2. Which of the following salts will give highest pH in water?

1. KCl
2. NaCl
3. Na₂CO₃
4. CuSO₄

Q3. “An acid is a substance that is capable of donating a hydrogen ion H⁺ and bases are substances capable of
accepting a hydrogen ion, H⁺ “.
The above statement is justified by

1. Arrhenius concept.
2. Bronsted-Lowry theory.
3. Lewis concept.
4. All of the above.

Q4. Which of the following reactions is correct regarding homogeneous equilibria?

Q5. Of the following, which change will shift the reaction towards the product at equilibrium?

1. Increase in total pressure.
2. Increase in temperature.
3. Decrease in concentration of I₂ .
4. Increase in concentration of I.

Q6. PH of water is 7 at 25°C. If water is heated at 80°C, its pH will:

1. Increase of.
2. Decrease.
3. Remains.
4. H conc. increase, OH decrease.

Q7. When no more solute can be dissolved in solution at a given temperature the solution is known as:

1. Supersaturated solution.
2. Saturated solution.
3. Unsaturated solution.
4. Both (a) and (b).

Q8. Dissolution of sodium sulphate is an exothermic process. If a saturated solution of sodium sulphate containing
extra undissolved sodium sulphate is heated, then:

1. More of sodium sulphate will dissolve.
2. Some sodium sulphate will be precipitated out.
3. Concentration of the solution will not change.
4. The solution will become supersaturated.

Q9. Which of the following solutions are acidic?

1. CuSO₄
2. CH₃ COONH₄
3. AlCl₃
4. Na₂CO₃

Q10. A buffer solution is a solution whose pH value on keeping in the air:

1. Increases rapidly.
2. Decreases rapidly.
3. May increase or decrease.
4. Does not change.

Q11.