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Acids

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Question 200

During the electrolysis of acidified water, a gas is collected at the negative electrode (cathode).

What is the correct and safe way to test this gas to confirm that it is hydrogen?

Hold a piece of damp blue litmus paper near the mouth of the test tube.

Place a lighted splint at the open mouth of the test tube.

Place a glowing splint inside the test tube.

Bubble the gas through a beaker of limewater.

Acids Questions

  1. GCSE
  2. /Chemistry
  3. /Acids

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.

Question bank