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 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 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 formed. The compound 'X' is

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 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 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 residue mixed with water form 'Y' . On passing an excess of CO_(2) through 'Y' in the 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. When mixed with water it forms Y. On passing excess of CO_(2) through Y in water a clear solution of Z is obtained. On boiling Z compound X is reformed. Compound X is