$A$ compound $X$ on heating gives a colourless gas. The residue is dissolved in water to obtain $Y$. Excess $CO_2$ is bubbled through the aqueous solution of $Y$ and $Z$ is formed. $Z$ on gentle heating gives back $X$. The compound $X$ is:
- A$CaCO_3$
- B$Ca(HCO_3)_2$
- C$Na_2CO_3$
- D$NaHCO_3$
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