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The compound A on heating gives a colour...

The compound A on heating gives a colourless gas and a residue that
dissolved in water to obtain B. Excess of `CO_(2)` is bubbled through aqueous solution of B,C is formed which is recovered in the solid form.
Solid C on gentle heating gives back A. The compound is:-

A

`CaCO_(3)`

B

`Ca(HCO_(3))_(2)`

C

`Na_(2)CO_(3)`

D

`NaHCO_(3)`

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The correct Answer is:
A
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