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Among the following oxides, which one acts as the most potent oxidizing agent?

1. Silicon dioxide (SiO2)
2. Germanium dioxide (GeO2)
3. Tin dioxide (SnO2)
4. Lead dioxide (PbO2)

Correct answer: Lead dioxide (PbO2)

Solution

Down group 14 the +2 state becomes more stable (inert-pair effect), so the +4 oxide of lead is the strongest oxidizer, readily reduced to Pb(II). PbO2 is the most potent oxidizing agent; GeO2 (stored) is very stable. Correct option: PbO2.

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