WAEC Chemistry 2020 Objective — Question 6
Question 6 of 50 from the West African Examinations Council (WAEC) Chemistry 2020 Objective paper, with the correct answer and a full explanation.
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What is the mass of silver deposited when 24,125 C of electricity is passed through a solution of silver salt? [Ag=108, 1F=96,500 C]
- A. 432 g
- B. 108 g
- C. 54 g
- D. 27 gCorrect
Explanation
Ag+ + e- -> Ag. 1 mole of Ag (108g) requires 1F (96,500 C). Thus, the mass of silver deposited when 24,125 C of electricity is used = (108g/96,500C) x 24,125C = 27 g.
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