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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