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A solid compound 'X' on heating gives CO...

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

A

`Ca (HCO_3)_2`

B

`Ca cO_3`

C

`Na_2 CO_3`

D

`Ca SO_4`

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The correct Answer is:
A
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