Home / iGCSE Chemistry 0620 Extended – 10.1 Water- Exam Style Questions Paper 2

iGCSE Chemistry 0620 Extended - 10.1 Water- Exam Style Questions Paper 2- New Syllabus

iGCSE Chemistry MCQ (Extended) Paper 2 - All Chapters

Question

A sample of water taken from a river contains harmful microbes.

What is a source of harmful microbes in the river water?

A. sewage
B. fertilisers
C. detergents
D. plastics

▶️ Answer/Explanation
Sewage contains human and animal waste teeming with bacteria, viruses, and other harmful microbes. Fertilisers, detergents, and plastics are chemical or physical pollutants—they do not introduce harmful microbes into the water.
✅ Answer: A

Question

Anhydrous copper(II) sulfate and anhydrous cobalt(II) chloride change colour when water is added to them.

Which row shows the correct colour changes?

▶️ Answer/Explanation
Anhydrous copper(II) sulfate is white and turns blue when water is added. Anhydrous cobalt(II) chloride is blue and turns pink with water. So the correct sequence is white to blue for copper sulfate and blue to pink for cobalt chloride.
✅ Answer: C

Question

Which flow chart describes the correct treatment sequence of the domestic water supply?

A. filtration → chlorination → sedimentation
B. sedimentation → chlorination → filtration
C. chlorination → filtration → sedimentation
D. sedimentation → filtration → chlorination

▶️ Answer/Explanation
The typical treatment sequence starts with sedimentation (settling of large solids), followed by filtration (removing smaller particles), and finally chlorination (adding chlorine to kill microbes).
✅ Answer: (D)
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