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A solid compound X on heating gives CO(2...

A solid compound X on heating gives `CO_(2)` gas and a residue. The residue mixed with water forms Y. On passing excess of `CO_(2)` through Y in water, a clear solution Z is obtained. On boiling Z, compound X is reformed. The compound X is

A

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

B

`CaCO_(3)`

C

`Na_(2)CO_(3)`

D

`K_(2)CO_(3)`

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