The compound (X) on heating gives a colourless gas a nd a residue that is dissolved in water to obtain (B). Excess of CO_2 is bubbled through aqueous solution of B, C is formed. Solid (C) on heating gives back X. (B) is

The compound (X) on heating gives a colourless gas a nd a residue that

1.	The compound (X) on heating gives a colourless gas a nd a residue that is dissolved in water to obtain (B). Excess of CO_2 is bubbled through aqueous solution of B, C is formed. Solid (C) on heating gives back X. (B) is
Answer» `CaCO_(3)` `CA(OH)_(2)` `Na_(2) CO_(3)` `NaHCO_(3)` Solution :`caCO_(3)overset(triangle)toCaO+CO_(2)` `CaO+H_(2)OtoCa(OH)_(2)` `Ca(OH)_(2)+CO_(2)toCaCO_(3)+H_(2)O`