A colourless solid substance (A) on heating evolved CO_2 and also gave a white residue, soluble in water. Residue also gave CO_2 when treated with dilute HCI.

A colourless solid substance (A) on heating evolved CO_2 and also gave

1.	A colourless solid substance (A) on heating evolved CO_2 and also gave a white residue, soluble in water. Residue also gave CO_2 when treated with dilute HCI.
Answer» `Na_(2)C)_(3)` `NaHCO_(3)` `CaCO_(3)` `Ca(HCO_(3))_(2)` Solution :`2NaHCO_(3)tounderset(downarrow)(2HCI)("Soluble in water")Na_(2)CO_(3)+H_(2)O+CO_(2)uparrow` `NaCI+H_(2)O+CO_(2)uparrow`