WAEC Chemistry 2022 Objective — Question 5
Question 5 of 50 from the West African Examinations Council (WAEC) Chemistry 2022 Objective paper, with the correct answer and a full explanation.
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What amount of electricity is required to deposit one mole of aluminium from a solution of AlCl3?
- A. One Faraday
- B. One ampere
- C. Three FaradaysCorrect
- D. Three amperes
Explanation
Aluminium is a trivalent element (Al³⁺), so depositing one mole of aluminium requires three Faradays of electricity (3 moles of electrons).
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