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JAMB Chemistry 1986 Question 22

Question 22

Metals and their Compounds

The reaction Mg + H2O → MgO + H2 takes place only in the presence of

  1. A.excess Mg ribbon
  2. B.excess cold water
  3. C.very hot water
  4. D.steam
Show the answer and explanation

Answer: D (steam)

Explanation

Magnesium reacts only very slowly with cold water (giving the hydroxide). Heated magnesium burns in steam to give magnesium oxide and hydrogen.