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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

`CaCO_3`

B

`Ca(HCO_3)_2`

C

`Na_2CO_3`

D

`NaHCO_3`

Text Solution

Verified by Experts

The correct Answer is:
B
`CaCO_3overset(Delta)toCaO+CO_2`
`CaOoverset(X)+H_2Otounderset(Y)Ca(OH)_2`
`Ca(OH)_2+2CO_2tounderset(Z)Ca(HCO_3)_2`
`underset(Z)Ca(HCO_3)_2overset(Delta)tounderset(X)CaCO_3+CO_(2)+H_2O`.
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