Question

An inorganic halide (A) gives the following reactions.

(i) The cation of (A) on raction with H2S in HCl medium, gives a ***** ppt. of (B). (A) neither gives ppt. with HCl nor blue colour with K4Fe(CN)6.

(ii) (B) on heating with dil.HCl gives back compound(A) and a gas (C) which gives a ***** ppt. with lead acetate solution.

(iii) The anion of (A) gives chromyl chloride test.

(iv) (B) dissolves in hot dil. HNO3 to give a solution, (D). (D) gives ring test.

(v) When NH4OH solution is added to (D), a white precipitate (E) is formed. (E) dissolves in minimum amount of dil. HCl to give a solution of (A). Aqueous solution of (A) on addition of water gives a whitish turbidity (F).

(vi) Aqueous solution of (A) on warming with alkaline sodium stannite gives a ***** precipitate of a metal (G) and sodium stannate. The metal (G) dissolves in hydrochloride acid to give solution of (A).

Identify (A) to (G) and give balanced chemical equations of reactions.

Answer 1

Observation of (i) indicates that cation (A) is Bi3+ because it does not give ppt. with HCl nor blue colour with K4Fe(CN)6, hence it is neither Pb2+ nor Cu2+. Since anion of (A) gives chromyl chloride test, hence it contains Cl– ions. Thus, (A) is BiCl3. Its different reactions are given below

Hence,

(A) is BiCl3,

(B) is Bi2S3,

(C) is H2S,

(D) is **(NO3)2,

(E) is **(OH)3,

(F) is BiOCl and (G) is **