Which among the following is strongest oxidising agent?

S n O_{2}

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S i O_{2}

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G e O_{2}

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P b O_{2}

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Solution

The correct option is A $P b O_{2}$
$P b O_{2}$ is strong oxidizing agent because $P b O_{2}$ is highly unstable
Since the stable oxidation state $P b$ is $+ 2$ but in $P b O_{2}$ the oxidation state of $P b$ is $+ 4$
$P b O_{2} ⟶ P b O + (O)$
$↓$
(nascent oxygen)
Stability of forming $+ 2$ oxidation state: $S i < G e < S n < P b$
$↓$
due to inert pair effect

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C O_{2}, S i O_{2}, S n O_{2}, P b O_{2} :

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