$H_{2} O_{2}$ changes black lead sulphide to white:

P b

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P b O_{2}

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P b O

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P b S O_{4}

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Solution

The correct option is C $P b S O_{4}$
The redox equation is as follows:
$P b S + 4 H_{2} O_{2} \to P b S O_{4} + 4 H_{2} O$
$P b S O_{4}$ is white in color.
The above reaction is used to clean black spots formed on old paintings. The black spots are of lead sulphide which is naturally formed over a long time due to the reaction between lead present in old oil paints and sulphur present in the air.

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P b S + H_{2} O_{2} \to P b S O_{4} + H_{2} O

P b S + H_{2} O_{2} \to P b S O_{4} + H_{2} O

P b S O_{4} + 2 e \to P b + S O_{4}^{2 -}

P b S O_{4} + 2 H_{2} O \to P b O_{2} + S O_{4}^{2 -} + 4 H + 2 e

H_{2} 3 O_{4}

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