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JAMB Chemistry 1984 Question 24

Question 24

Hydrogen, Oxygen and Oxides

From the reactions. ZnO + Na2O → Na2ZnO2 and ZnO + CO2 → ZnCO3 it may be concluded that zinc oxide is

  1. A.neutral
  2. B.basic
  3. C.acidic
  4. D.amphoteric
  5. E.a mixture
Show the answer and explanation

Answer: D (amphoteric)

Explanation

ZnO reacts with the basic oxide Na2O (acting as an acid) and with the acidic oxide CO2 (acting as a base). An oxide that does both is amphoteric.