Question

The melting point of a substance is 97.9${}^0$ C at atmospheric pressure. At room temperature, the state of the substance is :

• A. solid
• B. liquid
• C. gas
• D. plasma

Answer 1

The correct option is A solid

The substance described in the question is sodium and its state at room temperature is solid. A substance is said to be a solid if it's melting point is above room temperature under atmospheric pressure.

A substance is said to be a liquid if it's melting point is below room temperature and boiling point is above room temperature.

A substance is said to be a gas if it's boiling point is below room temperature under atmospheric pressure.