(B) The reaction between lead$(IV)$ oxide $(PbO_2)$ and concentrated nitric acid $(HNO_3)$ is a redox reaction where $PbO_2$ acts as an oxidizing agen

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(B) The reaction between lead$(IV)$ oxide $(PbO_2)$ and concentrated nitric acid $(HNO_3)$ is a redox reaction where $PbO_2$ acts as an oxidizing agent.The balanced chemical equation is:$PbO_2 + 2HNO_3 \to Pb(NO_3)_2 + H_2O + \frac{1}{2}O_2 \uparrow$As shown in the equation,oxygen gas $(O_2)$ is evolved during the reaction.