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Question
Account for the following:
PCl5 is more covalent than PCl3.
Solution
Greater the positive oxidation state of the central metal atom, greater is its polarising power and thus more is the covalent character of the bond formed between central metal atom and other atoms.
In PCl5, the central metal atom, P is in +5 oxidation state, while in PCl3, it is in +3 oxidation state. Therefore, PCl5 is more covalent than PCl3.
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