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In PbO2 oxidation no. of Pb is +4 and 
In Pb(NO3)2 is +2 
 Therefore, Pb atom gain two electrons.
2 5 2
PbO2  ------------------------>Pb(NO3)2
in PbO2 oxidation no. of Pb is +4 & in Pb(NO3)2 is +2
hence Pb atom gains 2 electron. and Pb atom get reduce.
1 4 1
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