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GK QUESTION#3184

Which metal is a constituent of the mineral kieserite (MgSO₄·H₂O)?

  1. ASilver
  2. BMagnesiumCorrect answer
  3. CPotassium
  4. DIron
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Answer

B. Magnesium

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Explanation

Kieserite has formula MgSO₄·H₂O: magnesium sulfate monohydrate. Its metal constituent is magnesium. Calling magnesium itself a mineral, as in the original stem, confuses an element with the mineral containing it.

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