O-LevelChemistryChemistry of the Environment5070/12 · Oct/Nov 2023 · Q301 Mark

Which statement about water is correct?

ADistillation is used to remove insoluble impurities from the domestic water supply.

BWater containing impurities turns anhydrous copper(II) sulfate blue.

CWater containing impurities turns cobalt(II) chloride paper blue.

DWater containing impurities boils at 100 °C.

✓ Correct answer

B: Water containing impurities turns anhydrous copper(II) sulfate blue.

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Topic: Chemistry of the Environment, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2023 Paper 1 Variant 2, question 30.

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