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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 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

`Na_(2)CO_(3)`

B

`K_(2)CO_(2)`

C

`Ca(HCO)_(3))_(2)`

D

`CaCO_(3)`

Text Solution

Verified by Experts

The correct Answer is:
4

The given compound `'X'` is `CaCO_(3)`
`underset((X))(CaCO_(3))overset(Delta)rarr underset(("residue"))(CaO+CO_(2)uarr),CaO+H_(2)O rarr underset((Y))(Ca(OH)_(2))`
`Ca(OH)_(2)+CO_(2)+H_(2)OrarrCa(HCO_(3))_(2)`
`Ca(HCO_(3))_(2)overset(Delta)rarrCaCO_(3)+CO_(2)uarr+H_(2)O`
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