Question detail

Which answer best matches the AQA GCSE Chemistry Potable water objective: describe desalination as a method for obtaining potable water from salty water or sea water?

Try the question, check the answer, then read the explanation to understand the curriculum point.

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At a glance

MCQ

Type

practice

Style

Topic

Using the Earth's resources and obtaining potable water

Question

A. Distillation
B. Reverse osmosis
C. Electrolysis
D. Filtration

Answer

The correct option is Electrolysis. It matches Potable water because it directly supports: Describe desalination as a method for obtaining potable water from salty water or sea water.

Explanation

The correct option is Electrolysis. It is correct because it tests describe desalination as a method for obtaining potable water from salty water or sea water within Using the Earth's resources and obtaining potable water. Keep the Using resources concept boundary clear: do not swap finite resources with renewable resources, potable water with pure water, reuse with recycling, alloys with pure metals, polymers with composites, corrosion with oxidation, or fertilisers with nutrients unless the question asks for that comparison. Other options are weaker if they answer a neighbouring resource or sustainability idea instead of this exact objective.

Common mistake

Confusing Desalination with Filtration

Students often confuse desalination with filtration, thinking both processes are the same for obtaining potable water.

Understand that desalination specifically refers to the removal of salt from salty water or sea water, while filtration is a separate process that removes impurities from water.

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