`CO_(2)` gas along with solid `(Y)` is obtained when sodium salt `(X)` is heated. `(X)` is again obtained when `CO_(2)` has is p

`CO_(2)` gas along with solid `(Y)` is obtained when sodium salt `(X)` is heated. `(X)` is again obtained when `CO_(2)` has is passed into `(Y)`. `X` & `Y` are-
A. `Na_(2)CO_(3), Na_(2)O`
B. `Na_(2)CO_(3), NaOH`
C. `NaHCO_(3),Na_(2)CO_(3)`
D. `Na_(2)CO_(3), NaHCO_(3)`

`CO_(2)` gas along with solid `(Y)` is obtained when sodium salt `(X)` is heated. `(X)` is again obtained when `CO_(2)` has is passed into `(Y)`. `X`

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