A white powder "A" on heating gave a non-combustible gas and a white residue

CHEMISTRY · Single correct · GCSE · Chemistry · Chemical Analysis · Chemical Analysis

Problem

A white powder "A" on heating gave a non-combustible gas and a white residue. The residue on heating turns yellow. The residue dissolves in dil.

\text{HCl}

and the solution gives a white ppt. with

\text{K}_4[\text{Fe}(\text{CN})_6]

. "A" would be: (1)

\text{CaCO}_3

(2)

\text{ZnCO}_3

(3)

\text{CaSO}_3

(4)

\text{CuCO}_3