H₂O₂ is used to restore oil paintings. Explain giving reasons.

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Solution

White lead in the oil paintings get blackened due to action of H₂S present in atmosphere in traces.
$P b (O H)_{2} . 2 P b C O_{3} + 3 H_{2} S \to 3 P b S + 2 C O_{2} + 4 H_{2} O W h i t e l e a d B l a c k$
When blackened PbS are treated with H₂O₂, the PbS is oxidized to PbSO₄which is white in colour. So the painting is restored again.

$P b S + 4 H_{2} O_{2} \to P b S O_{4} + 4 H_{2} O W h i t e$

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