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 isA. `CaCO_(3)`B. `Na_(2)CO_(3)`C. `K_(2)CO_(3)`D. `Ca(HCO_(3))_(2)`

A solid compound X on heating gives `CO_(2)` gas and a residue. When m

1.	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 isA. `CaCO_(3)`B. `Na_(2)CO_(3)`C. `K_(2)CO_(3)`D. `Ca(HCO_(3))_(2)`
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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 isA. `CaCO_(3)`B. `Na_(2)CO_(3)`C. `K_(2)CO_(3)`D. `Ca(HCO_(3))_(2)`

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