The compound 'A' on heating gives a colourless gas and a residue. The residue dissolves in water to obtain (B). When excess of CO_(2) is bubbled through aqueous solution of B gentle heating gives back A. Compound 'C' is

The compound 'A' on heating gives a colourless gas and a residue. The

1.	The compound 'A' on heating gives a colourless gas and a residue. The residue dissolves in water to obtain (B). When excess of CO_(2) is bubbled through aqueous solution of B gentle heating gives back A. Compound 'C' is
Answer» `CaCO_(3)` `CA(HCO_(3))_(2)` `NaCO_(3)` `NaHCO_(3)` Solution :`CaCO_(3)(X)overset(Delta)rarrCaO+CO_(2)uarroverset(H_(2)O)rarrCa(OH)_(2)(Y)overset(CO_(2))rarrCa(HCO_(3))_(2)(Z)`