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A solid compound X on heating gives CO2 ...

A solid compound X on heating gives `CO_2` gas and a residue. The residue mixed with water forms Y on passing an 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_2CO_3`

D

`K_2CO_3`

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