Class 12 Chemistry Solutions MCQs with Answers

At Sainik School, our Class 12 Chemistry MCQs on “Solutions” provide students with a comprehensive platform to master this fundamental topic. Covering various aspects of solutions, including types of solutions, colligative properties, solubility, and concentration units, these multiple-choice questions offer thorough preparation for Class 12 Chemistry exams.

Our MCQs challenge students to apply their knowledge of solution chemistry to solve problems and analyze scenarios, fostering critical thinking and analytical skills essential for success in exams. Each MCQ is accompanied by a detailed answer explanation, enabling students to grasp the underlying concepts thoroughly.

By practicing Class 12 Chemistry MCQs on “Solutions” at Sainik School, students not only prepare effectively for their exams but also gain a deeper understanding of the principles governing solution behavior, equipping them with essential skills for their academic pursuits and future careers in science and technology.

Q1. The value of Henry’s constant K is _.

1. Greater for gases with higher solubility.
2. Greater for gases with lower solubility.
3. Constant for all gases.
4. Not related to the solubility of gases.

Q2. Which of the following statements is false?

1. Two different solutions of sucrose of same molality prepared in different solvents will have the same
   depression in freezing point.
2. The osmotic pressure of a solution is given by the equation (where C is the molarity of the
   solution).
3. Decreasing order of osmotic pressure for 0.01M aqueous solutions of barium chloride, potassium chloride,
   acetic acid and sucrose is BaCl₂ > KCl > CH₃ COOH > sucrose.
4. According to Raoult’s law, the vapour pressure exerted by a volatile component of a solution is directly
   proportional to its mole fraction in the solution.

Q3. On the basis of information given below mark the correct option.
Information: On adding acetone to methanol some of the hydrogen bonds between methanol molecules break.

1. At specific composition methanol-acetone mixture will form minimum boiling azeotrope and will show
   positive deviation from Raoult’s law.
2. At specific composition methanol-acetone mixture forms maximum boiling azeotrope and will show positive
   deviation from Raoult’s law.
3. At specific composition methanol-acetone mixture will form minimum boiling azeotrope and will show
   negative deviation from Raoult’s law.
4. At specific composition methanol-acetone mixture will form maximum boiling azeotrope and will show
   negative deviation from Raoult’s law.

Q4. The values of Van’t Hoff factors for KCl, NaCl and K₂ SO₄ , respectively, are __.

1. 2, 2 and 2
2. 2, 2 and 3
3. 1, 1 and 2
4. 1, 1 and 1

Q5. Colligative properties are observed when _.

1. A non volatile solid is dissolved in a volatile liquid.
2. A non volatile liquid is dissolved in another volatile liquid.
3. A gas is dissolved in non volatile liquid.
4. A volatile liquid is dissolved in another volatile liquid.

Q6. Isotonic solutions must have the same _.

1. Solute.
2. Density.
3. Elevation in boiling point.
4. Depression in freezing point.

Q8. Intermolecular forces between two benzene molecules are nearly of same strength as those between two
toluene molecules. For a mixture of benzene and toluene, which of the following are not true?

Q9. In isotonic solutions __.

1. Solute and solvent both are same.
2. Osmotic pressure is same.
3. Solute and solvent may or may not be same.
4. Solute is always same solvent may be different.

Q10. Which of the following statements is false?

1. Units of atmospheric pressure and osmotic pressure are the same.
2. In reverse osmosis, solvent molecules move through a semipermeable membrane from a region of lower
   concentration of solute to a region of higher concentration.
3. The value of molal depression constant depends on nature of solvent.
4. Relative lowering of vapour pressure, is a dimensionless quantity.

Q11. Which of the following aqueous solutions should have the highest boiling point?

Q12. On dissolving sugar in water at room temperature solution feels cool to touch. Under which of the following cases
dissolution of sugar will be most rapid?

1. Sugar crystals in cold water.
2. Sugar crystals in hot water.
3. Powdered sugar in cold water.
4. Powdered sugar in hot water.

Q13. Value of Henry’s constant K_h __.

1. Increases with increase in temperature.
2. Decreases with increase in temperature.
3. Remains constant.
4. First increases then decreases.

Q14. Consider the and mark the correct option.

1. Water will move from side (A) to side (B) if a pressure lower than osmotic pressure is applied on piston (B).
2. Water will move from side (B) to side (A) if a pressure greater than osmotic pressure is applied on piston (B).
3. Water will move from side (B) to side (A) if a pressure equal to osmotic pressure is applied on piston (B).
4. Water will move from side (A) to side (B) if pressure equal to osmotic pressure is applied on piston (A).

Q15. Which of the following units is useful in relating concentration of solution with its vapour pressure?

1. Mole fraction.
2. Parts per million.
3. Mass percentage.
4. Molality.