A compound X on heating gives a colourless gas. The residue is then dissolved in water to obtain Y. Excess $C O_{2}$ is bubbled through the aqueous solution of Y, then Z is formed. Z on gentle heating gives back X. Then 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 A $C a C O_{3}$
$C a C O_{3}$ on heating gives a colourless gas $C O_{2}$ and $C a O$ as the residue. $C a O$ with water will form $C a (O H)_{2}$ and when treated with excess $C O_{2}$ will give $C a (H C O_{3})_{2}$ which on heating gives back $C a C O_{3}$ .

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The compound X on heating gives a colourless gas . The residue is dissolved in water to obtain Y. Excess CO₂ is bubbled through aqueous solution of Y,Z is formed . Z on gentle heating gives back X. The compound X is:

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: