WAEC Chemistry 2019 Theory — Question 5
Question 5 of 28 from the West African Examinations Council (WAEC) Chemistry 2019 Theory paper, with the correct answer and a full explanation.
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1(e)(i) Write the equation for the reaction between zinc oxide and I. dilute tetraoxosulphate(VI) acid, II. Sodium hydroxide solution. (ii) State which property of zinc oxide is shown by the reactions in 1(e)(i). [5 marks]
Model answer
(i) I. ZnO + H2SO4 → ZnSO4 + H2O II. ZnO + 2NaOH + H2O → Na2Zn(OH)4 (ii) These equations demonstrate the amphoteric nature of ZnO — a substance is amphoteric if it can react with both an acid and a base.
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