GKFix MCQ Question

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