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JAMB Chemistry 1982 Question 47

Question 47

Chemical Formulae and Equations

1.00 g of the oxide of metal X (atomic mass = 64) gave 0.80 g of the metal when reduced with hydrogen. The formula of the oxide is

  1. A.X2O
  2. B.XO
  3. C.XO2
  4. D.X2O3
  5. E.X3O4.
Show the answer and explanation

Answer: B (XO)

Explanation

Oxygen = 0.20 g = 0.0125 mol; metal = 0.80/64 = 0.0125 mol. The 1 : 1 ratio gives XO.