WAEC Chemistry 2021 Theory — Question 28
Question 28 of 31 from the West African Examinations Council (WAEC) Chemistry 2021 Theory paper, with the correct answer and a full explanation.
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5(b). ZnO is an amphoteric oxide. Write equations to illustrate this statement.
Model answer
As a base (reacting with acid): ZnO(s) + 2HCl(aq) → ZnCl2(aq) + H2O(l). As an acid (reacting with base): ZnO(s) + 2NaOH(aq) → Na2ZnO2(aq) + H2O(l).
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