A compound $X$ on heating gives a colorless gas. The residue is dissolved in water to obtain $Y$ . Excess $C O_{2}$ is bubbled through aqueous solution of $Y$ and $Z$ is formed. $Z$ on gentle heating gives back $X$ . The $X$ is:

C a C O_{3}

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

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N a_{2} C O_{3}

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N a H C O_{3}

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Solution

The correct option is B $C a C O_{3}$
$C a C O_{3} 800^{o} C ⇌ C a O + C O_{2}$

$C a O q u i c k l i m e + H_{2} O ⟶ C a (O H)_{2} S l a k e d l i m e$

Lime water turns mily on passing $C O_{2}$ gas.

$C a (O H)_{2} + C O_{2} ⟶ C a C O_{3} M i l k i n e s s + H_{2} O$

$C a C O_{3} E x c e s s o f C O_{2} ⟶ C a (H C O_{3})_{2} (s o l u b l e)$

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