A student adds dilute hydrochloric acid to a solid sample of copper(II) carbonate in a test tube. A rapid effervescence is observed, a gas is evolved, and a blue-green solution is formed.
Which of the following describes the correct test and observation to identify the gas produced?
Hold a lighted splint near the mouth of the test tube; the gas burns with a characteristic 'squeaky pop'.
Insert a glowing splint into the test tube; the splint relights.
Bubble the gas through limewater; the liquid turns cloudy.
Hold damp blue litmus paper near the mouth of the test tube; the paper turns red and is then bleached white.
Practise Edexcel GCSE Chemistry Acids with exam-style questions for Foundation and Higher tier. 100 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.