Q .     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

AIPMT 2004
A

`Ca(HCO_3)_2`

B

`CaCO_3`

C

`Na_2CO_3`

D

`K_2CO_3`

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