Assertion (A): Alkali metals are soft and have low Melting and boiling points.
Reason (R): This is because interatomic bonds are weak.

Options

A. Both (A) and `(R)` are not true
B. (A) is true but `(R)` is not the correct explanation of (A)
C. (A) is true but `(R)` is false
D. Both (A) and `(R)` are true and `(R)` is the correct explanation of (A)

Answer

D

Explanation

Melting and boiling points of alkali metals are very low and decrease further with increase in atomic number due to weakening of metallic bond.