A compound $X$ on heating gives a colourless gas. The residue is dissolved in water to give $Y$ . To the aqueous solution of $Y$ , $C O_{2}$ is passed and it produces $Z$ , which on gentle heating gives back $X$ . Compound $X$ is:

$N a_{2} C O_{3}$

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$C a C O_{3}$

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$C a (H C O_{3})_{2}$

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$N a H C O_{3}$

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Solution

The correct option is B
$C a C O_{3}$

$C a c O_{3} Δ - \to C a O + C O_{2} ↑ C a O H_{2} O - - \to C a (O H)_{2} (Y) 2 C O_{2} - -- \to C a (H C O_{3})_{2} (Z) C a (H C O_{3})_{2} Δ - \to C a C O_{3} + H_{2} O + C O_{2} ↑$

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