Statement-1:When `H_(2)S` gas is passed into an aqueous solution of `ZnCl_(2),Zn^(2+)` ions are completely precipitated as zinc sulphide.
Statement-2 :Zinc sulphide is soluble in solutions of caustic alkali as well as in dilute `HCl`.

Options

A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-1.
B. Statement-1 is True, Statement-2- is True, Statement-2 is NOT a correct explanation for Statement-12
C. Statement-1 is True, Statement-2 is False
D. Statement-1 is False, Statement-2 is True

Answer

D

Explanation

Partial ppt. of ZnS occurs in neutral solutions, because `S^(2-)`-ion conc. Derived from `H_(2)S` is depressed too much by `[H^(+)]_("Acid")`, such that `K_(sp)` of `ZnS` is not exceeded much. Alkali solutions increase `[S^(2-)]` by removing `H^(+)`, thus, promoting `ZnS` ppt.