Conversion of \( \mathrm{PbSO}_{4} \) to \( \mathrm{PbS} \) is: (A) reduction of S (B) oxidation...

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Conversion of \( \mathrm{PbSO}_{4} \) to \( \mathrm{PbS} \) is:
(A) reduction of S
(B) oxidation of \( S \)
(C) dissociation
(D) none of these
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