(i) A white solid A, on being strongly heated, leaves a residue which is yellow while hot and white when cold
ii) The solid A, insoluble in water, dissolves in dilute HCI to give a solution B and a gas which does not affect acidified dichromate paper but turns baryta water milky.
iii) When `H_(2)S` is passed through the solution B, a white precipitate C is obtained
iv) The precipitate C dissolves in dilute HCI to give a solution which, when treated with an NaOH solution, gives a white precipitate. The final precipitate dissolves in an excess of NaoH form a solution D. This alkaline solution, on acidification with acetic acid followed by treatment with `H_(2)S`, gives the precipitate C.
The salt A is a

Options

A. sulphite
B. carbonate
C. sulphide
D. chloride

Answer

B

Explanation

Salt A is carbonate