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A compound $X$ on heating gives a colourless gas. The residue is dissolved in water to obtain $Y$. Excess $\mathrm{CO}_{2}$ is passed through aqueous solution of $Y$ when $Z$ is formed. $Z$ on gentle heating gives back $X$. The compound $X$ is
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$\mathrm{CaCO}_{3}$
$\mathrm{Ca}\left(\underset{\mathrm{Z}}{\mathrm{HCO}_{3}}\right)_{2} \stackrel{\Delta}{\longrightarrow} \underset{\mathrm{x}}{\mathrm{CaCO}_{3}}+\mathrm{CO}_{2} \uparrow+\mathrm{H}_{2} \mathrm{O}$
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