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


(a) Draw the structures of the following :

(i) PCl5(s)                                          (ii) SO32-

(b) Explain the following observations :

(i) Ammonia has a higher boiling point than phosphine.

(ii) Helium does not form any chemical compound.

(iii) Bi (V) is a stronger oxidising agent than Sb (V).

(a) (i) PCl5s

(ii) SO32-

Shape : Pyramidal

Angle : The angle O-S-O is greater than 90°

(b) (i) Due to intermolecular H-bonding in NH3 it has higher boiling point than PH3 which does not have any H-bonding.

(ii) Because the ionization energy of Helium is very high and very high positive electrons gain enthalpy.

(iii) The stability of +5 oxidation state decreases and that of +3 state increases due to inert pair effect down the group therefore Bi(v) accepts two electrons and gets reduced to Bi(v).


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