WAEC Chemistry 2025 Theory — Question 58

Question 58 of 70 from the West African Examinations Council (WAEC) Chemistry 2025 Theory paper, with the correct answer and a full explanation.

5(d)(i). Mention one industrial process in which each of the following compounds is used: Al(OH)3; KAl(SO4)2; Na3AlF6.

Model answer

Al(OH)3: extraction/purification of bauxite, dyeing industry. KAl(SO4)2 (alum): water treatment. Na3AlF6 (cryolite): aluminium production/extraction of aluminium.

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