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4.2 Identifying the products of chemical reactions

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Question 15

A technician collects a gas made by one of these processes.

ProcessDescription
1A metal reacts with a dilute acid
2Hydrogen peroxide decomposes
3A solution containing chloride ions is electrolysed

The technician tests the gas:

  • a lit splint held at the mouth of the tube does not give a squeaky pop
  • damp blue litmus paper held in the gas does not change colour.

Explain which process made the gas. Describe a test, and its result, that would confirm the identity of the gas.

[4]
Markscheme

4.2 Identifying the products of chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /4.2 Identifying the products of chemical reactions

107 exam-style questions on OCR GCSE Chemistry 4.2 Identifying the products of chemical reactions, covering 4.2.1 Tests to identify gases, 4.2.2 Tests for aqueous ions and flame tests, and 4.2.3 Instrumental methods of analysis. Each one has a worked solution and a mark scheme showing where the marks go.

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