The best oxidising agent among the following oxides is :

S n O_{2}

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P b O_{2}

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H g O

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M g O

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Solution

The correct option is B $P b O_{2}$
As we move down the group, lower oxidation states become more stable than higher ones due to inert pair effect. Hence, $P b (I I)$ is more stable than $P b (I V)$ . This is why $P b O_{2}$ has a high tendency to accept electrons and convert into $P b O$ . Therefore, it acts as a strong oxidising agent.

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