A solid compound 'X' on heating gives CO_(2)gas and a residue. The residue when 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 when 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» `Ca(HCO_(3))_(2)` `CaCO_(3)` `Na_(2)CO_(3)` `K_(2)CO_(3)` ANSWER :B