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Question

The best oxidising agent among the following oxides is :

A
SnO2
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B
PbO2
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C
HgO
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D
MgO
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Solution

The correct option is B PbO2
As we move down the group, lower oxidation states become more stable than higher ones due to inert pair effect. Hence, Pb(II) is more stable than Pb(IV). This is why PbO2 has a high tendency to accept electrons and convert into PbO. Therefore, it acts as a strong oxidising agent.

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