A white solid X on heating gives a white solid Y and an acid gas Z. gas Z is also given out when X reacts with an acid. The compound Y is also formed if caustic soda is left open in the atmosphere. X, Y and Z are

Options

A. `X-NaHCO_(3),Y-Na_(2)CO_(3),Z-CO_(2)`
B. `X-Na_(2)CO_(3),Y-NaOH,Z-CO_(2)`
C. `X-Na_(2)CO_(3),Y-NaHCO_(3),Z-CO_(2)`
D. `X-NaOH, Y-NaHCO_(3),Z-CO_(2)`

Answer

A

Explanation

`underset((X))(2NaHCO_(3)) to underset((Y))(Na_(2)CO_(3))+underset((Z))(CO_(2))+H_(2)O`
`underset((X))(NaHCO_(3))+HCl to NaCl+ underset((Z))(CO_(2))+H_(2)O`
`underset(("atmosphere"))(2NaOH+CO_(2)to underset((Y))(Na_(2)CO_(3))+H_(2)O`