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  4. Nitrogen can form only one chloride with chlorine which is NCl3 whereas P can form PCl3 and PCl5. This is

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Q. Nitrogen can form only one chloride with chlorine which is $NCl_3$ whereas $P$ can form $PCl_3$ and $PCl_5$. This is

The p-Block Elements - Part2

Solution:

Nitrogen due to its unavailability of $d$ - orbitals it can form only one chloride i.e, $NCl _{3}$.
Whereas $P$ has vacant $d$ - orbital and hence can expand its octet, thus can form $PCl _{5}$.