A compound A on heating gives a colourless gas and a residue that is dissolved in water to obtained B . Excess of `CO_(2)` is bubbled through aqueous solution of B , C is formed which is recovered in the solid form . Solid C on gentle heating gives back A . The compound isA. `CaCO_(3)`B. `Na_(2)CO_(3)`C. `K_(2)CO_(3)`D. `CaSO_(4) . 2 H_(2)O`

A compound A on heating gives a colourless gas and a residue that is d

1.	A compound A on heating gives a colourless gas and a residue that is dissolved in water to obtained B . Excess of `CO_(2)` is bubbled through aqueous solution of B , C is formed which is recovered in the solid form . Solid C on gentle heating gives back A . The compound isA. `CaCO_(3)`B. `Na_(2)CO_(3)`C. `K_(2)CO_(3)`D. `CaSO_(4) . 2 H_(2)O`
Answer» Correct Answer - A `underset((A))(CaC)O_(3)(s) overset(Delta)(to) CO_(2) (g) + CaO(s)` `CaO (s) + H_(2)O (l) to underset((B))(Ca(OH)_(2)) (aq)` `underset((B)) (Ca(OH)_(2)) (aq) + underset(("excess"))(2 CO_(2)) (g) to Caunderset((C))((HCO_(3))_(2)) (aq) ` `Caunderset((C))((HCO_(3))_(2)) (aq) overset(Delta)(to) Ca underset((A))(CO_(3)) (s) + CO_(2) (g) + H_(2)O(l)`

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