WAEC Chemistry 2011 Theory — Question 14
Question 14 of 31 from the West African Examinations Council (WAEC) Chemistry 2011 Theory paper, with the correct answer and a full explanation.
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3(c) Write a balanced equation to illustrate the reaction of Al2O3 with dilute I. HCl; II. NaOH. (ii) What is the name given to an oxide that exhibits both acidic and basic properties? (iii) Give one metallic oxide which exhibits these properties.
Model answer
I. Al2O3(s)+6HCl(aq)→2AlCl3(aq)+3H2O(l). II. Al2O3+2NaOH+3H2O→2NaAl(OH)4. (ii) Amphoteric oxide. (iii) Aluminium oxide (Al2O3); Zinc oxide (ZnO) are examples of amphoteric oxides.
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