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8.2 Identification of common gases

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Question 7

A technician monitors gases released from two reaction vessels. A fresh piece of damp blue litmus paper is held in each gas outlet.

Gas outletObservation after 2 secondsObservation after 20 seconds
XThe paper turns redThe paper turns white
YThe paper turns redThe paper remains red
a.

Explain which gas outlet releases chlorine.

[2]
b.

Explain why the observation after 2 seconds is not enough to distinguish chlorine from the other gas.

[2]
c.

A dry piece of blue litmus paper is held in gas outlet X. Suggest what would be observed and explain your answer.

[2]
Markscheme

8.2 Identification of common gases Questions

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

89 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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