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Unilorin Post-UTME Chemistry 2022 (Model questions) Question 9

Question 9

Water

Which of the following is hydroscopic substance?

  1. A.NaNO3
  2. B.MgCl2
  3. C.FeCl2
  4. D.CaCl2
Show the answer and explanation

Answer: A (NaNO3)

Explanation

Sodium nitrate absorbs moisture without dissolving (hygroscopic). MgCl2 and CaCl2 absorb so much water that they dissolve, so they are called deliquescent.