# NEET Chemistry The p-Block Elements (XII) Questions Solved

BOARD

Account for the following:

(i) $PC{l}_{5}$ is more covalent than $PC{l}_{3}.$

(ii) Iron on reaction with HCl forms $FeC{l}_{2}$ and not $FeC{l}_{3}.$

(iii) The two O-O bond lengths in the ozone molecule are equal.

(i) In $PC{l}_{5},$ phosphorus has +5 oxidation state and has less tendency to loose electrons than in +3 of $PC{l}_{3}.$ Therefore, $PC{l}_{5}$ has more tendency to share ${e}^{-1}s$ than $PC{l}_{3}.$

(ii) Because HCl on reaction with iron liberates ${H}_{2}$ gas which prevents the formation of ferric chloride.

(iii) Due to resonance the two oxygen atoms have partial double bond character and thus have same bond length i.e. 128 pm

Difficulty Level: