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4.2 Identifying the products of chemical reactions

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Question 4

An agricultural laboratory uses flame emission spectroscopy to check four nutrient solutions.

The tables show reference wavelengths for four metal ions and the wavelengths recorded for the solutions.

Metal ionReference wavelengths (nm)
Sodium589.0, 589.6
Potassium404.4, 766.5, 769.9
Calcium422.7, 616.2, 643.9
Copper(II)510.5, 515.3, 521.8
SolutionWavelengths recorded (nm)
Solution A510.5, 515.3, 521.8
Solution B589.0, 589.6
Solution C404.4, 766.5, 769.9
Solution D422.7, 616.2, 643.9

Which solution contains potassium ions?

[1]
A

Solution A

B

Solution D

C

Solution C

D

Solution B

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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