Question

Statement–1: The value of the van der Waals constant ‘a’ is larger for $N{H}_3$ than $P{H}_3$.
Statement–2: Hydrogen bonding is present in $N{H}_3$

• A. Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1
• B. Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1
• C. Statement-1 is True, Statement-2 is False
• D. Statement-1 is False, Statement-2 is True

Answer 1

The correct option is A Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1

‘$a$’ represents attraction between molecules. Due to existance of H-bonding in $N{H}_3$, the intermolecular forces of attraction are stronger, hence $N{H}_3$ has a larger value of ‘$a$’ than $P{H}_3$.