(B) $PbO_2$ acts as a strong oxidizing agent. When it reacts with concentrated $HNO_3$,it undergoes reduction while oxidizing the acid or water presen

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(B) $PbO_2$ acts as a strong oxidizing agent. When it reacts with concentrated $HNO_3$,it undergoes reduction while oxidizing the acid or water present,leading to the evolution of oxygen gas. The reaction is: $2PbO_2 + 4HNO_3 \rightarrow 2Pb(NO_3)_2 + 2H_2O + O_2 \uparrow$. Therefore,the correct option is $B$.