A compound (X) on decomposition gives a colorless gas. The residue is dissolved in water to obtain (Y) Excess ${CO}_{2}$ is bubbled through an aqueous solution of (Y) and (Z) on gentle heating and gives back (X). Then (X) is:

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${CaCO}_{3}$

$Ca {({HCO}_{3})}_{2}$

${NaHCO}_{3}$

${Na}_{2} {CO}_{3}$

answer is A.

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Detailed Solution

The decomposition can be given as,

${CaCO}_{3} \overset{Δ}{⟶} {CO}_{2} + CaO \overset{H_{2} O}{\to}$ $Ca (OH)_{2}$ $\to_{C O_{2}}^{E x c e s s}$

${CaCO}_{3} ↓ \overset{∆}{\leftarrow} {Ca}_{⟵} {({HCO}_{3})}_{2}$

Here, x is Calcium Carbonate.

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