Heating compound $(A)$ produces a colorless gas and a residue $(B)$ which dissolves in water. Passing excess $CO_2$ gas through the aqueous solution of $(B)$ yields compound $(C)$,which is obtained in solid state. Gently heating compound $(C)$ gives back the white solid $(A)$. What is compound $(A)$?
- A$CaSO_4 \cdot 2H_2O$
- B$CaCO_3$
- C$Na_2CO_3$
- D$K_2CO_3$
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