When magnesium ribbon is added to dilute hydrochloric acid, hydrogen gas is produced.
Which observation shows that a gas has been produced?
A solid precipitate forms at the bottom of the tube
Effervescence is observed in the test tube
The solution turns from blue to colourless
The magnesium ribbon melts into a shiny sphere
Practise Edexcel GCSE Chemistry Acids with exam-style questions for Foundation and Higher tier. 276 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.
