Which oxide is the best reducing agent?

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${NO}_{2}$

${SO}_{2}$

${CO}_{2}$

${SiO}_{2}$

answer is D.

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Detailed Solution

${SO}_{2}$ oxide is the best reducing agent.

Sulfur is in the oxidation state +4 in ${SO}_{2}$ and has to lose two more electrons to reach the oxidation state +6. It may therefore lose and acquire electrons, acting as both an oxidizing and a reducing agent.

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