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Chemistry · May / June 2024 · Paper 12 · Question 30

5070Water

The presence of water can be confirmed by the use of either anhydrous cobalt(II) chloride or anhydrous copper(II) sulfate. Which observation is correct if water is present?

  1. AAnhydrous cobalt(II) chloride turns from blue to white.
  2. BAnhydrous cobalt(II) chloride turns from pink to blue.
  3. CAnhydrous copper(II) sulfate turns from blue to pink.
  4. DAnhydrous copper(II) sulfate turns from white to blue.

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Correct answer: D. Anhydrous copper(II) sulfate turns from white to blue.

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