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A compound X on heating gives a colourle...

A compound X on heating gives a colourless gas. This residue is dissolved in water to obtain Y. excess `CO_(2)` is bubbled through aqueous solution of Y, Z is formed. Z on gentle heating give back X. the X is

A

`CaCO_(3)`

B

`Ca(HCO_(3))_(2)`

C

`Na_(2)CO_(3)`

D

`NaHCO_(3)`

Text Solution

Verified by Experts

The correct Answer is:
A
`underset((X))(CaCO_(3))overset(Delta)to CaO+underset("colourless")(CO_(2))`
`CaO+H_(2)tounderset(Ca(OH)_(2))`
`Ca(OH)_(2)+2CO_(2)tounderset((Z))(Ca(HCO_(3))_(2)`
`Ca(HCO_(3))_(2) overset(Delta)tounderset((X))(CaCO_(3))+CO_(2)+H_(2)O`
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