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Question

(a) Account for the following :
(i) Interhalogens are more reactive than pure halogens.
(ii) N2 is less reactive at room temperature.
(iii) Reducing character increases from NH3 to BiH3.

(b) Draw the structures of the following :
(i) H4P2O7 (Pyrophosphoric acid)
(ii) XeF4

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Solution

(a) (i) This is because the bond in the interhalogen (X - X') is weaker than X -X and X' - X' bond in the halogens. This is due to less effective overlapping between orbitals of dissimilar atoms than those between similar atoms.

(ii) N2 is less reactive at room temperature due to its high bond dissociation energy (NN bond).

(iii) As we move from NH3 to BiH3, the thermal stability of hydrides decreases and their tendency to liberate hydrogen increases. Hence, the reducing character increases from NH3 to BiH3.



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