An aqueous solution of a substance gives a white precipitate on treatment with dil. HCl, which dissolved on heating. On passing H2S in hot acidic solution a black precipitate is formed. The substance is:
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a
Hg22+ salt
b
Cu 2+ salt
c
Ag+ salt
d
Pb2+ salt
answer is D.
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Detailed Solution
PbCl2 is soluble in hot water but insoluble in cold water.Pb2+ + 2HCl →Δ PbCl2soluble →H2S PbSblack