Question

Assertion (A): Seawater freezes below $0°\mathrm{C}$.

Reason (R): Freezing point increases due to the addition of impurities.

• A. Both A and R are true and R is the correct explanation of A.
• B. Both A and R are true, but R is not the correct explanation of A.
• C. A is true and R is false.
• D. A is false and R is true.

Answer 1

The correct option is C

A is true and R is false.

The explanation for the correct option:

1. Assertion (A) is true: when a non-volatile solute is added to a solvent, there is a depression in the freezing point of the solvent. As Seawater has non-volatile salts dissolved in it, thus it freezes below 0$°$C.
2. Reason (R) is false: The freezing point does not increase due to the addition of impurities but it decreases.

Conclusion: The correct option is c).