$A$ 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$NaHCO_3$
- D$NaOH$
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