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

BOARD

(a) Draw the structures of the following :

(i) ${H}_{2}{S}_{2}{O}_{7}$                                     (ii) $HCl{O}_{3}$

(b) Explain the following observations :

(i) In the structure of $HN{O}_{3},$ the N-O bond (121 pm) is shorter than the N-OH bond (140 pm).

(ii) All the P-Cl bonds in $PC{l}_{5}$ are not equivalent.

(iii) ICI is more reactive than ${I}_{2}.$

(a) (i) ${H}_{2}{S}_{2}{O}_{7}$ (Pyrosulphuric acid) or oleum :

(ii) :

(b) (i) The N-O bond has partial double bond character while the N-OH bond is a single bond in both resonance of $HN{O}_{3}.$

(ii) All the P-Cl bonds in $PC{l}_{5}$ are not equivalent due to the fact that the axial bond pairs suffer more repulsion as compared to equatorial bond pairs.

(iii) Because ICI bond is weaker than I-I bond as a result of which ICI breaks easily to form halogen atoms which readily bring about the reaction, hence more reactive.

Difficulty Level: