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CAIE IGCSE Chemistry 12.4.3 Substances and Assess Their Purity Questions

Work through real CAIE IGCSE Chemistry questions to interpret impurity shifts and compare measured boiling or melting points with reference values.

Syllabus
2026–2028
Course
Chemistry 0620

Exam points

  • identify pure substances using characteristic melting-point and boiling-point values
  • explain that impurities generally lower melting point and raise boiling point
  • use boiling-point or melting-point data to identify an unknown substance and assess its purity
  • describe testing a product such as ethanol by measuring its boiling temperature and comparing with reference data

CAIE IGCSE Chemistry 12.4.3 Substances and Assess Their Purity Questions question 1

[Maximum number: 1]

Which substance should be pure for the intended use?

A

a drug for curing disease

B

limestone for iron extraction

C

petroleum for fractional distillation

D

water for washing a car

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