Question

Hydrogen peroxide is used to restore the colour of old oil painting lead oxide with balanced reaction

Answer 1

The white pigment in old painting turns black due to formation of PbS.This white pigment is restored by using hydrogen peroxide.The reaction is as follows:

H2O2(aq) + PbS(s) →PbSO4(s) + H2O(l)                              white pigment

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Answer 2

hydrogen peroxide acts as an oxidizing agent and converts black lead sulphate to white lead sulphate.
PbS(s)+4H202(aq)=PbSo4(s)+4H20(aq)