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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

`CaCO_(3)`

C

`Na_(2)CO_(3)`

D

`K_(2)CO_(3)`

Text Solution

Verified by Experts

The correct Answer is:
B
`underset((X))(CaCO_(3))rarrCaO+CO_(2)uarr`
`CaO+H_(2)O rarrunderset(Y)(Ca(OH)_(2))`
`Ca(OH)_(2)+2CO_(2)rarr underset(Z)(Ca(HCO_(3))_(2))`
`Ca(HCO_(3))_(2)overset(Delta)(rarr)CaCO_(3)+H_(2)O+CO_(2)uarr`
`Cu^(+2)+CN^(-)+underset((X))((CN)_(2)uarr)`
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