Class Chemistry 11 Equilibrium MCQs with Answer

Engaging in Class 11 Chemistry Equilibrium MCQs with answers is a valuable strategy for Sainik School aspirants seeking proficiency in chemistry concepts. These multiple-choice questions are meticulously designed to align with the class 11 curriculum, specifically focusing on the equilibrium topic. By incorporating a range of questions and clear answers, this resource serves as an effective aid for students preparing for their Sainik School exams. Mastering equilibrium principles is crucial for understanding chemical reactions, and these MCQs provide a targeted approach to reinforce comprehension.

As candidates gear up for Sainik School entrance exams, practicing these MCQs not only aids in self-assessment but also enhances problem-solving skills and exam readiness. The content is tailored to the class 11 chemistry syllabus, ensuring relevance and applicability for students navigating the Sainik School admission process. In addition to academic excellence, this resource fosters a deeper understanding of equilibrium dynamics, contributing to a well-rounded education.

Q1. Which of the following is an example of a reversible reaction?

Q2. What is pH of resulting solution when equal volume when equal of 0.1M NaOH and 0.01M HCl are mixed?

1. 7
2. 1.04
3. 12.65
4. 2.0

Q3. The pH of neutral water at 25°C is 7.0. As the temperature increases, ionisation of water increases, however, the
concentration of H⁺ ions and OH^– ions are equal. What will be the pH of pure water at 60°C?

1. Equal to 7.0
2. Greater than 7.0
3. Less than 7.0
4. Equal to zero.

Q4.

1. Favour the formation of N₂O₄ .
2. Favour the decomposition of N₂O₄
3. Does not affect the equilibrium.
4. Stops the process.

Q5. What will be the correct order of vapour pressure of water, acetone and ether at 30°C. Given that among these
compounds, water has maximum boiling point and ether has minimum boiling point?

1. Water < ether < acetone.

2. Water < acetone < ether.

3. Ether < acetone < water.

4. Acetone < ether < water.

Q6. On increasing the pressure, in which direction will the gas phase reaction proceed to re-establish equilibrium, is
predicted by applying the Le Chatelier’s principle. Consider the reaction.

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

1. K will remain same.
2. K will decrease.
3. K will increase.
4. K will increase initially and decrease when pressure is very high.

Q7. The solubility product of a sparingly soluble salt AB at room temperature is 1.21 × 10^-6 , its molar solubility is:

1. 1.21 × 100M.
2. 1.1 × 10^-4 M.
3. 1.1 × 10^-3 M.
4. None of these.

Q8. The concentration of hydrogen ion in a sample of soft drink is 3.8 × 10^-3 M. What is its pH?

1. 4.32
2. 5.12
3. 3.31
4. 2.42

Q9. Which of the following is not a general characteristic of equilibria involving physical processes?

1.Equilibrium is possible only in a closed system at a given temperature.

2. All measurable properties of the system remain constant.
3. All the physical processes stop at equilibrium.
4. The opposing processes occur at the same rate and there is dynamic but stable condition.

Q10.

Q11. A 0.2 molar solution of formic acid is 3.2% ionised. Its ionisation constant is:

1. 9.6 × 10^-3
2. 2.1 × 10^-4
3. 1.25 × 10^-6
4. 4.8 × 10^-5

Q12. Which one of the following informations can be obtained on the basis of Le-Chatelier principle?

1. Dissociation constant of a weak acid.
2. Entropy change in a reaction.
3. Equilibrium constant of a chemical reaction.
4. All of the above.

Q13. At a particular temperature and atmospheric pressure, the solid and liquid phases of a pure substance can exist in
equilibrium. Which of the following term defines this temperature?

1. Normal melting point.
2. Equilibrium temperature.
3. Boiling point.
4. Freezing point.

Q14. Hydronium ion concentration in molarity is more conveniently expressed on a logarithmic scale known as the:

1. pH scale.
2. pOH scale.
3. Ionic product of water.
4. Both (a) and (b).

Q15. Which of the following is correct regarding buffer sol?

1. It contains a weak acid and its conjugate base.
2. It contains a weak base and its conjugate acid.
3. It shows little change in pH on adding small amount of acid or base.
4. None of the above