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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 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

`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
Compound X is `CaCO_(3)`
`underset(X)(CaCO_(3))overset(Delta)rarr underset("Residue")(CaO)+CO_(2)uarr`
`underset("Residue")(CaO) + H_(2)O rarr underset(Y)(Ca(OH)_(2))`
`underset(Y)(Ca(OH)_(2))+underset("Excess")(CO_(2))+ H_(2)O rarr underset(Z)(Ca(HCO_(3))_(2))`
`underset(Z)(Ca(HCO_(3))_(2))overset(Delta)rarrunderset(X)(CaCO_(3)) + H_(2)O + CO_(2)uarr`
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