When concentrated hydrochloric acid is heated with solid manganese(IV) oxide, a pale green gas is evolved.
Describe the observations made when a piece of damp blue litmus paper is held in a test tube containing this gas.
106 exam-style questions on Edexcel GCSE Chemistry 7.2 Group 7, covering 7.2.1 Physical properties of the halogens, 7.2.2 Reactions of the halogens, 7.2.3 Relative reactivity and displacement reactions of the halogens, and 7.2.4 Halogen displacement as a redox reaction. Each one has a worked solution and a mark scheme showing where the marks go.