An aqueous solution of a substance gives a white percipitate on treatment with dil `HCl`, which dissole on heating. On passing `H_(2)S` in hot acidic solution a black percipitate is formed. The substance is:

An aqueous solution of a substance gives a white precipitate on treatment with dilute HCl, which dissolves on heating. On passing H_2S in hot acidic solution a black precipitate is formed. Identify the substance.

An aqueous solution of a substance gives a white percipitate on treatment with dil ,HCI which dissolves on heating .When H_(2)S is passed through the hot acidic solution a black precipitate is obtained .The substances are not :

An aqueous solution of a substance gives a white precipitate on treatment with dilute HCI, which dissolves on heating. When hydrogen sulphide is passed through the hot acidic solution, a black precipitate is obtained. The substance is a:

An aqueous solution of a substance 'X' gives a white ppt. on treatment with dil. HCI, which dissolves on heating. When hydrogen sulphide is passed through the hot acidic solution, a black ppt. is obtained. 'X' is:

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