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

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

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C a C O_{3}

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N a H C O_{3}

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{N a}_{2} C O_{3}

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Solution

The correct option is B $C a C O_{3}$
$C a C O_{3} Δ - \to C a O + C O_{2} (c o l o u r l e s s g a s)$

$C a O + H_{2} O \to C a (O H)_{2}$

$C a (O H)_{2} + 2 C O_{2} E x c e s s - --- \to C a (H C O_{3})_{2}$

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

Hence, the compound $X$ is $C a C O_{3}$ .

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