Which gas is evolved when MnO2 is heated with HCl? Share with your friends Share 0 Vishal Thamizharasan answered this chlorine gas... gf noob 4 View Full Answer Devika Priyadersini answered this could u gve me d reaction plzzz 1 Vishal Thamizharasan answered this ah sureThe action of manganese dioxide on hydrochloric acid proceeds in two stages. The dark brown solution formed in the cold contains a higher chloride of manganese, MnCl4 or MnCl3, which breaks up on warming with liberation of chlorine:MnO2 + 4HCl = MnCl4 + 2H2O;MnCl4 = MnCl2 + Cl2;2MnO2 + 8HCl = 2MnCl3 + Cl2 + 4H2O; 2MnCl3 = 2MnCl2 + Cl2.HAPPY?? 5 Prerna Bansal answered this Dear Student,Your friend has correctly answered the question.the equation can be represented in one step as :MnO2 + 4 HCl → MnCl2 + 2 H2O + Cl2 Hope it helps.Cheers!@tehnoob:very good attempt.Keep it Up!thumbs up! 1