A gas obtained by addition of dil.H2SO4 to an unknown mixture, which turns lead acetate paper black. The unknown mixture contains:

Question

A gas obtained by addition of dil.H2SO4 to an unknown mixture, which turns lead acetate paper black. The unknown mixture contains: (A) Sulphite (B) Sulphide (C) Sulphate (D) Thiosulphate

Tardigrade Admin · Accepted Answer

It must be sulphide as ( CH 3 COO )2 Pb + H 2 S ( g ) arrow 2 CH 3 COOH + PbS ( Black ppt )

Q. A gas obtained by addition of $d i l . H_{2} S O_{4}$ to an unknown mixture, which turns lead acetate paper black. The unknown mixture contains:

Sulphite

Sulphide

Sulphate

Thiosulphate

It must be sulphide as
$(C H_{3} COO)_{2} P b + H_{2} S (g) \to 2 C H 3 COO H + P b S ($ Black ppt $)$

Q. A gas obtained by addition of dil.H2​SO4​ to an unknown mixture, which turns lead acetate paper black. The unknown mixture contains: