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

BOARD

(a) Draw the structures of the following molecules ;

(i) ${H}_{3}P{O}_{2}$                                     (ii) $CI{F}_{3}$

(b) Explain the following observations :

(i) Nitrogen is much less reactive than phosphorus.

(ii) Despite having greater polarity, hydrogen fluoride boils at a lower temperature than water.

(iii) Sulphur has greater tendency for catenation than oxygen in the same group.

(a) (i) ${H}_{3}P{O}_{2}$ :

(ii) $CI{F}_{3}$

SP3d hybridization

Shape : T-shape

(b) (i) Because P-P bond is weaker than N$\equiv$N bond, ${N}_{2}$ is inert due to the presence of triple bond.

(ii) In water O is larger than F therefore Vander-Waals forces of attraction increase with increase in size and hence the boiling point increases.

(iii) It is because S-S bond is stronger than O-O bond as there is more interelectronic repulsion in

O-O than in S-S.

Difficulty Level: