Question

The lightest liquid metal is

• A. $\mathrm{Hg}$
• B. $\mathrm{Na}$
• C. $\mathrm{Cs}$
• D. $\mathrm{Fr}$

Answer 1

The correct option is C

$\mathrm{Cs}$

Explanation for the correct option:

(C)

• $\mathrm{Cs}$ is a metal that belongs to Group-1 i.e. alkali metals.
• At room temperature, it is liquid.
• It is less dense than $\mathrm{Hg}$ (also a liquid metal).

Explanation for the incorrect options:

(A) $\mathrm{Hg}$

• $\mathrm{Hg}$ is a kind of metal.
• At room temperature, it is liquid.
• It is denser than $\mathrm{Cs}$ (also a liquid metal).
• Hence this option is not correct.

(B) $\mathrm{Na}$

• $\mathrm{Na}$ is an alkali metal.
• At room temperature, it is solid.
• Hence this option is not correct.

(D) $\mathrm{Fr}$

• $\mathrm{Fr}$ is a metal that belongs to Group-1 i.e. alkali metals.
• At room temperature, it is solid.
• Hence this option is not correct.

Hence, the correct option is (C) i.e.,$\mathrm{Cs}$.