a solid formed by reaction of 2 gases, one of which is acidic and the other basic in nature Share with your friends Share 0 Megha Sharma answered this Dear student, Acidic Gas = HCl Basic Gas = NH3 NH3 + HCl = NH4Cl Regards 0 View Full Answer Waleed answered this When HCl which is an acidic gas, reacts with HN3 which is a basic gas in nature, NH4Cl is formed which is white crystalline salt a solid. HCl + HN3 = NH4Cl Ammonia + Hydrogen chloride = AmmoniumCholride 1