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Chemistry · May / June 2024 · Paper 12 · Question 24

5070Preparation of salts

Which statement about water of crystallisation is correct?

  1. AThe ratio of CoCl2 : H2O in hydrated cobalt(II) chloride is 6 : 1.
  2. BThe ratio of CuSO4 : H2O in hydrated copper(II) sulfate is 1 : 5.
  3. CWhen a saturated solution is heated, the water that evaporates is called the water of crystallisation.
  4. DWhen white copper(II) sulfate is heated, blue crystals are formed.

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Correct answer: B. The ratio of CuSO4 : H2O in hydrated copper(II) sulfate is 1 : 5.

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