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Account for the following : (i) PCl(5)...

Account for the following :
(i) `PCl_(5)` is more covalent than `PCl_(3)`.
(ii) Iron on reaction with `HCl` forms `FeCl_(2)` and not `FeCl_(3)`.
(iii) The two `O-O` bond lengths is the ozone molecule are equal.

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(i) Because `+5` oxidation state is more covalent than `+3`/ high charge to size ratio/high polarizing power.
(ii) Because `HCl` is a mild oxidising agnet/formation of hydrogen gas prevents the formation of `FeCl_(3)`.
(iii) Because of resonance in `O_(3)` molecule.
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