An aqueous solution of silver nitrate gives a white precipitate with

An aqueous solution of a white salt A gives a white precipitate B on treatment with dilute HCI in cold conditions. B is soluble in boiling water. An aqueous solution of A gives a yellow precipitate on treatment with a solution of K_(2)CrO_(4) . The soda extract of A is acidified with dilute H_(2)SO_(4) boiled to remove CO_(2) and treated with a freshly prepared solution of FeSO_(4) Concentrated H_(2)SO_(4) is added to the resulting solution (along the walls of the test tube so that the H_(2)SO_(4) forms a separate layer). A brown ring is formed at the junction of the two layers. On treatment with a Kl solution, an aqueous solution of A will give

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 gas 'X' is passed through water to form a saturated solution. The aqueous solution on treatment with silver nitrate gives a white precipitate. The saturated aqueous solution also dissolves magnesium ribbon with evolution of a colourless gas 'Y'. Identify 'X' and 'Y':

When copper is added to a solution of silver nitrate, silver is precipitated. This is due to i) oxidation of silver ii) oxidation of copper iii) oxidation of silver iv) reduction of silver ion The correct combination is

Which one of the following compounds in aqueous solution gives a white precipitate with perchloric acid?

A white powder when strongly heated gives off brown fumes. A solution of this powder gives as yellow precipitate with a solutin of KI. When a solution of barium chloride is added to a solution of powder, a white precipitate results. This white powder may be