Question

The table given below gives information about four unknown substances (Room temperature = ${30}^{\circ }C$)

Substance	Melting point ${}^{\circ }C$	Boiling point ${}^{\circ }C$
I	-188	-40
II	-110	34
III	16	117
IV	37	340

Which of the following substances is a volatile liquid ?

• A. I
• B. II
• C. III
• D. IV

Answer 1

The correct option is B II

A substance is said to be volatile if it boils at a low temperature, changing from the liquid to the gas phase. Substances that are gases at room temperature are extremely volatile.

According to question Substance $II$ is volatile because its boiling temperature is very near to room temperature.