Question

A colourless solid (X) on heating evolved `CO_(2)` and also gave a white residue , soluble in water. Residue also gave `CO_(2)` when treated with silute acid. (X) is
A. `Na_(2)CO_(3)`
B. `CaCO_(3)`
C. `Ca(HCO)_(2)`
D. `NaHCO_(3)`

Answer 1

Correct Answer - D
`Na_(2)CO_(3) overset(Delta)to ` No effect
`CaCO_(3) underset(-CO_(2))overset(Delta)to CaO overset("Acid")to CO_(2)`
`Ca(HCO_(3))_(2) underset(-CO_(2))overset(Delta)to underset("Water insoluble")(CaCO_(3))overset("Acid")to CO_(2)`
`NaHCO_(3) underset(-CO_(2))overset(Delta)to underset("Water soluble")(Na_(2)CO_(3))overset("Acid")to CO_(2)`