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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

`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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