CourseCourseConceptConcept

CAIE IGCSE Chemistry 10.1.2 To Test for the Purity of Water Using Questions

Work through real CAIE IGCSE Chemistry questions to test water samples and explain how impurities affect physical-property observations.

Syllabus
2026–2028
Course
Chemistry 0620

Exam points

  • use anhydrous copper(II) sulfate or cobalt(II) chloride to test for water
  • describe the positive colour change in a water test
  • distinguish pure water from impure water using boiling point and residue observations

CAIE IGCSE Chemistry 10.1.2 To Test for the Purity of Water Using Questions question 1

[Maximum number: 1]

Which statement identifies a sample of water as pure?

A

It melts at room temperature.

B

It turns anhydrous copper(II) sulfate blue.

C

It turns hydrated cobalt(II) chloride from blue to pink.

D

It boils at 100∘C100^{\circ} \mathrm{C}.

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