The compound $A$ on heating gives a colourless gas and a residue that is dissolved in water to obtain $B$. Excess of $CO_2$ is bubbled through aqueous solution of $B$,$C$ is formed which is recovered in the solid form. Solid $C$ on gentle heating gives back $A$. The compound $A$ is:
- A$CaCO_3$
- B$Na_2CO_3$
- C$K_2CO_3$
- D$CaSO_4 \cdot 2H_2O$
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