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REDOX REACTIONS AND ELECTROCHEMISTRY
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Why does PbO2 not react with HNO3 in the reaction Pb3O4 + 4HNO3 → 2Pb(NO3)2 + PbO2 + 2H2O?
A. HNO3 is a reducing agent
B. HNO3 is already an oxidizing agent
C. PbO2 is a reducing agent
D. PbO2 does not exist
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