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6.3 Interpreting and interacting with earth systems

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Question 19

At a waste water treatment plant, water still contains fine insoluble particles and harmful microorganisms. A technician uses process P followed by process Q. The processes are chosen from screening through a mesh, filtration through sand and gravel, and chlorination.

TestAfter process PAfter process Q
Fine insoluble particlesNot detectedNot detected
Harmful microorganismsDetectedNot detected

Which option identifies processes P and Q?

[1]
A

P is chlorination; Q is filtration.

B

P is filtration; Q is screening.

C

P is filtration; Q is chlorination.

D

P is screening; Q is chlorination.

Markscheme

6.3 Interpreting and interacting with earth systems Questions

  1. GCSE
  2. /Chemistry
  3. /6.3 Interpreting and interacting with earth systems

109 exam-style questions on OCR GCSE Chemistry 6.3 Interpreting and interacting with earth systems, covering 6.3.1 Formation and evolution of the atmosphere, 6.3.2 The greenhouse effect and climate change, 6.3.3 Sources and problems of atmospheric pollutants, and 6.3.4 Producing potable water. Each one has a worked solution and a mark scheme showing where the marks go.

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