JEE Main Chemistry question

HO restores the colour of old lead paintings, blackened —

(A)Converting PbO to Pb
(B)Oxidising PbS to PbSOCorrect
(C)Converting PbCO to Pb
(D)Oxidising PbSO to PbSO

Answer: (B)

Solution

Old lead-based paintings darken over time because atmospheric HS converts the white lead pigment into black lead sulphide (PbS). Treating the painting with HO oxidises this black

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Question ID VK-137420