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

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

1.	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 isA. `Ca(HCO_(3))_(2)`B. `CaCO_(3)`C. `Na_(2)CO_(3)`D. `K_(2)CO_(3)`
Answer» Correct Answer - B `underset((X))(CaCO_(3))rarrCaO+CO_(2)uarr` `CaO+H_(2)O rarrunderset(Y)(Ca(OH)_(2))` `Ca(OH)_(2)+2CO_(2)rarr underset(Z)(Ca(HCO_(3))_(2))` `Ca(HCO_(3))_(2)overset(Delta)(rarr)CaCO_(3)+H_(2)O+CO_(2)uarr` `Cu^(+2)+CN^(-)+underset((X))((CN)_(2)uarr)`

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