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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

`Ca(OH)_(2)`

C

`CaCO_(3)`

D

`CaO`

Text Solution

Verified by Experts

The correct Answer is:
A
The reactions can be shown as
`underset((X))(CaCO_(3))tounderset("Residue")(CaO)+CO_(2)`
`CaO+H_(2)Otounderset((Y))(Ca(OH)_(2))`
`Ca(OH)_(2)+2CO_(2)tounderset((Z))(Ca(HCO_(3))_(2))`
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