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Q.

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

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a

${NaHCO}_{3}$

b

${CaCO}_{3}$

c

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

d

${Na}_{2} C O_{3}$

answer is A.

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