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10.1 Using the Earth's resources and obtaining potable water

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Question 20
H

A factory produces waste water containing dissolved lead compounds. Why can this waste water not be made safe by the biological treatment used for sewage?

[1]
A

Lead compounds are broken down by bacteria into more harmful products

B

Lead compounds dissolve in water, so screening and sedimentation remove them

C

Lead compounds are not organic, so biological treatment does not remove them

D

Lead compounds react with the oxygen bubbled through the aeration tank

Markscheme

10.1 Using the Earth's resources and obtaining potable water Questions

  1. GCSE
  2. /Chemistry
  3. /10.1 Using the Earth's resources and obtaining potable water

40 exam-style questions on AQA GCSE Chemistry 10.1 Using the Earth's resources and obtaining potable water, covering 10.1.1 Using the Earth's resources and sustainable development, 10.1.2 Potable water, 10.1.3 Waste water treatment, and 10.1.4 Alternative methods of extracting metals. Each one has a worked solution and a mark scheme showing where the marks go.

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