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8.2 Identification of common gases

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Question 22
H

A student holds damp red litmus paper in a test tube of chlorine and the paper turns white. A second student says this shows the paper must have been blue at the start. Why is the second student wrong?

[1]
A

Chlorine bleaches litmus paper of either starting colour.

B

Red litmus paper cannot be made damp before the test.

C

Chlorine turns red litmus paper blue before bleaching.

D

Only blue litmus paper can be used to test any gas.

Markscheme

8.2 Identification of common gases Questions

  1. GCSE
  2. /Chemistry
  3. /8.2 Identification of common gases

40 exam-style questions on AQA GCSE Chemistry 8.2 Identification of common gases, covering 8.2.1 Test for hydrogen, 8.2.2 Test for oxygen, 8.2.3 Test for carbon dioxide, and 8.2.4 Test for chlorine. Each one has a worked solution and a mark scheme showing where the marks go.

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