A compound X on heating gives a colourless gas. The residue is dissolved in water to obtain Y. Excess `CO_2` is bubbled

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Q 2114656550.     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 when Z is formed. Z on gentle heating gives back X. The X is
A

`CaCO_3`

B

`Ca(HCO_3)_2`

C

`Na_2CO_3`

D

`NaHCO_3`

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Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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