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CAIE IGCSE Chemistry 10.1.6 Harmful Substances Toxic Metal Questions

Work through real CAIE IGCSE Chemistry questions to classify water pollutants and explain their effects on oxygen levels and aquatic organisms.

Syllabus
2026–2028
Course
Chemistry 0620

Exam points

  • identify nitrate and phosphate fertilisers as causes of eutrophication and deoxygenation
  • identify harmful substances in river water that threaten aquatic life
  • distinguish dissolved oxygen from pollutants when assessing water quality

CAIE IGCSE Chemistry 10.1.6 Harmful Substances Toxic Metal Questions question 1

[Maximum number: 1]

Which pollutant leads to the deoxygenation of water in ponds and lakes?

A

fertilisers containing nitrates and phosphates

B

toxic metal compounds

C

combustion products of fossil fuels

D

acid rain

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