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

BOARD

Explain the following :

(a) $N{O}_{2}$ readily forms a dimer.

(b) $BiC{l}_{3}$ is more stable than $BiC{l}_{5}.$

$N{O}_{2}$ contains i.e. 23 odd electrons. In the valence shell N has seven electrons and hence less stable. To acquire stability it dimerizes to form ${N}_{2}{O}_{4}$

(b) $BiC{l}_{3}$ is more stable than $BiC{l}_{5}$ due to inert pair effect because as we move down the group, the stability of +3 oxidation state increases and of +5 decreases.

Difficulty Level:

• 75%
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