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 solid compound 'X' on heating gives CO_(2)gas and a residue. The res

1.	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....
Answer» `Na_(2)CO_(3)` `K_(2)CO_(3)` `Ca(HCO_(3))_(2)` `CaCO_(3)` Solution :The given compound X must be `CaCO_(3)`. It can be explained by FOLLOWINGREACTIONS, `underset((X))(CaCO_(3)) overset(Delta)to underset(("Residue"))(CaO+CO_(2)UARR),CaO+H_(2)underset((Y))to Ca(OH)_(2)` `Ca(OH)_(2)+CO_(2)+H_(2)O to underset((Z))(Ca(HCO_(3)))` `Ca(HCO_(3))_(2) overset(Delta)to underset((X))(CaCO_(3))+CO_(2)uarr+H_(2)O`