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Comprehension-7: (Q. 23 to \( Q .26) \)
\( \mathrm{P} \) A white water insoluble solid \( (A) \) turns yellow on W heating and becomes white on cooling. Solid \( (A) \) gives a clear solution \( (B) \) when treated with \( \mathrm{HCl} \) solution or treatment with excess \( \mathrm{NaOH} \) solution \( (C) \). When \( \mathrm{H}_{2} \mathrm{~S} \) is bubbled through \( B \) nothing is obtained; however if \( B \) is made neutral, \( \mathrm{H}_{2} \mathrm{~S} \) causes the precipitation of white compound \( D \).
Identify \( A \) :
(a) \( \mathrm{ZnS} \)
(b) \( \mathrm{ZnO} \)
(c) \( \mathrm{MnO} \)
(d) \( \mathrm{FeO} \)
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