Question

. The compound A on heating gives a
colourless gas and a residue that is
dissolved in water to obtain B. Excess of
CO, is bubbled through aqueous solution
of B, C is formed which is recovered in the
solid form. Solid Con gentle heating gives
back A. The compound is
(a) CaCO3
(b) Na CO,
(c) K2CO3
(d) CaSO4 2H20.
Please explain WHY NOT others....PLEASE​

Answer 1

option : A

caco3......

calcium carbonate...