Question

Assertion (A): Pure acetic acid forms an ice-like solid when cooled.

Reason (R): It is known as dry ice.

Options

• If both A and R are true, and R is the correct explanation of A.

• If both A and R are true, but R is not the correct explanation of А.

• If A is true, but R is false.

• If both A and R are false.

Answer 1

If A is true, but R is false.

Explanation:

Assertion (A) is true because pure, anhydrous acetic acid has a relatively high freezing point (16.6°C) and readily freezes into a crystalline, ice-like solid when cooled, which is why it is commonly called glacial acetic acid. However, reason (R) is false because the term dry ice refers exclusively to solid carbon dioxide (CO₂), not acetic acid. Since the reason contains a completely incorrect scientific fact, it cannot serve as the explanation.