To an aqueous solution containing ions such as Al 3 + , Zn 2 + , Ca 2 + , Fe 3 + , Ni 2 + , Ba 2 + and Cu 2 + was added conc .   HCl , followed by H 2 S . The total number of cations precipitated during this reaction is/are :

Question

To an aqueous solution containing ions such as Al 3 + , Zn 2 + , Ca 2 + , Fe 3 + , Ni 2 + , Ba 2 + and Cu 2 + was added conc . &#160; HCl , followed by H 2 S . The total number of cations precipitated during this reaction is/are :

Aicharya · Accepted Answer

Al 3 + and Fe 3 + sulphides hydrolyse in water. Ni 2 + and Zn 2 + require basic medium with H 2 &#160; S to form precipitate. Ca 2 + and Ba 2 + sulphides are also soluble. only Cu 2 + can form the precipitate with H 2 S in the acidic medium.

To an aqueous solution containing ions such as Al 3 + , Zn 2 + , Ca 2 + , Fe 3 + , Ni 2 + , Ba 2 + and Cu 2…

Solution