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_2S. The…

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. HCl, followed by H_2S. The total number of cations precipitated during this reaction is/are :

MARKS Content Team · Accepted Answer

Correct answer: (A) 1. Al^(3+) and Fe^(3+) sulphides hydrolyse in water. Ni^(2+) and Zn^(2+) require basic medium with H_2 S to form precipitate. Ca^(2+) and Ba^(2+) sulphides are also soluble. only Cu^(2+) can form the precipitate with H_2S 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 ${Cu}^{2 +}$ was added $conc . HCl$ , followed by $H_{2} S$ . The total number of cations precipitated during this reaction is/are :

Solution

Relevant Questions

To an aqueous solution containing ions such as Al3+,Zn2+,Ca2+,Fe3+,Ni2+,Ba2+ and Cu2+ was added conc. HCl, followed by H2S. The total number of cations precipitated during this reaction is/are :

Solution

Relevant Questions

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 :