An aqueous solution of a substance gives a white precipitate on treatment with `NaCI` solution, which dissolves on heating. When `H_(2)S` gas is passed through it's hot acidic solution, a black precipitate is obtained. The cations which are not associated with this test are:

Options

A. `Mg^(2+)`
B. `Ag^(+)`
C. `Hg_(2)^(2+)`
D. `Pb^(2+)`

Answer

A, B, C