CO2 gas is evolved. The reaction is as follows:
NaHCO3Sodiumhydrogen carbonate+HCl(aq)Hydrogenchloride→NaCl(aq)Sodiumchloride+H2O(l)Water+CO2Carbondioxide↑
When the produced gas is passed through lime water, lime water turns milky which confirms that the evolved gas is CO2
Ca(OH)2Calcium hydroxide(Lime water)(aq)+CO2(g)→CaCO3(s)WhitePrecipitate+H2O(l)