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JAMB Chemistry 1985 Question 45

Question 45

Metals and their Compounds

When marble is heated to about 1473 K, another white solid is obtained which reacts vigorously with water to give an alkaline solution. The solution contains

  1. A.NaOH
  2. B.KOH
  3. C.Mg(OH)2
  4. D.Zn(OH)2
  5. E.Ca(OH)2.
Show the answer and explanation

Answer: E (Ca(OH)2.)

Explanation

Marble (CaCO3) decomposes to quicklime, CaO. Quicklime reacts vigorously with water to give calcium hydroxide, Ca(OH)2.