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.
Practise Edexcel GCSE Chemistry Group 7 with exam-style questions for Foundation and Higher tier. 87 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.