Answer
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Hint: Apply the concept of colligative properties in this question.Colligative properties are those which depend on the number of solute particles present in the solution. A non-volatile solute is the one which does not evaporate into gas.
Complete step by step answer:
Certain properties of dilute solutions containing non-volatile solute do not depend on the nature of the solute dissolved but depend only on the concentration. Such properties are called colligative properties.
There are four colligative properties –
1. Vapour pressure
- It follows Raoult’s law.
- When a non-volatile substance is dissolved in a liquid, the vapour pressure of the liquid or solvent is lowered.
- Therefore, option (a) is correct.
2. Freezing point
- When a non-volatile substance is dissolved in a liquid, the freezing point of the liquid or solvent is lowered.
- This is known as depression in freezing point.
- Therefore, option (b) is incorrect.
3. Boiling point
- When a non-volatile substance is dissolved in a liquid, the boiling point of the liquid or solvent increases.
- This is known as elevation in boiling point.
- Therefore, option (c) is correct.
4. Osmotic pressure
- When a non-volatile substance is dissolved in a liquid, the osmotic pressure of the liquid or solvent increases.
- Therefore, option (d) is incorrect.
Therefore, the answer is – option (a) and option (c).
Note: We can keep the following points in mind –
1. Study of elevation in boiling point of a liquid in which a non-volatile solute is dissolved is known as ebullioscopy.
2. Study of depression in freezing point of a liquid in which a non-volatile solute is dissolved is known as cryoscopy.
Complete step by step answer:
Certain properties of dilute solutions containing non-volatile solute do not depend on the nature of the solute dissolved but depend only on the concentration. Such properties are called colligative properties.
There are four colligative properties –
1. Vapour pressure
- It follows Raoult’s law.
- When a non-volatile substance is dissolved in a liquid, the vapour pressure of the liquid or solvent is lowered.
- Therefore, option (a) is correct.
2. Freezing point
- When a non-volatile substance is dissolved in a liquid, the freezing point of the liquid or solvent is lowered.
- This is known as depression in freezing point.
- Therefore, option (b) is incorrect.
3. Boiling point
- When a non-volatile substance is dissolved in a liquid, the boiling point of the liquid or solvent increases.
- This is known as elevation in boiling point.
- Therefore, option (c) is correct.
4. Osmotic pressure
- When a non-volatile substance is dissolved in a liquid, the osmotic pressure of the liquid or solvent increases.
- Therefore, option (d) is incorrect.
Therefore, the answer is – option (a) and option (c).
Note: We can keep the following points in mind –
1. Study of elevation in boiling point of a liquid in which a non-volatile solute is dissolved is known as ebullioscopy.
2. Study of depression in freezing point of a liquid in which a non-volatile solute is dissolved is known as cryoscopy.
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