$A$ solid compound $X$ on heating gives $CO_2$ gas and a residue. The residue mixed with water forms $Y$. On passing an excess of $CO_2$ through $Y$ in water,a clear solution $Z$ is obtained. On boiling $Z$,compound $X$ is reformed. The compound $X$ is
- A$Na_2CO_3$
- B$K_2CO_3$
- C$Ca(HCO_3)_2$
- D$CaCO_3$
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