Question

An aqueous solution of a substance gives a white precipitate on treatment with dilute hydrochloric acid, which dissolves on heating. When hydrogen sulphide is passed through the hot acidic solution, a black precipitate is obtained. The substance is a
A. `Hg_(2)^(2+)` salt
B. `Cu^(2+)` salt
C. `Ag^(+)` salt
D. `Pb^(2+)` salt

Answer 1

Correct Answer - D
`Pb^(+2)+2HCl to underset("White ppt. dissolves on boiling")(PbCl_(2))darr overset(H_(2)S)to underset("Black ppt.")(PbS)darr`