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Can PCl5 act as an oxidising as well as a reducing agent? Justify.

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Oxidation state of P in PCl5 is +5. Since P has five valence electrons in its valence shell, therefore it cannot increase its oxidation state beyond +5 by donating its electrons, therefore PCl5 cannot act as a reducing agent. However, it can decrease its oxidation number from +5 to +3 or some lower value, therefore PCl5 acts as an oxidising agent. For example, it oxidises Ag to AgCl.

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