Q.

An aqueous solution of a substance on treatment with dilute HCl, gives a white precipitate soluble in hot water. When H2S is passed through the hot solution of the salt in dil HCl, a black precipitate is formed. The salt is

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a

Hg22+  salt

b

Cu 2+  salt

c

Ag +  salt

d

Pb 2+  salt

answer is D.

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Detailed Solution

Pb2+ in dilute HCl form PbCl2 (White ppt.) 

Pb2+inH2 S in presence of dilHCl gives PbS (Black ppt.) 

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