Post-UTME Chemistry 2019 Objective — Question 4
Question 4 of 20 from the Post-UTME Screening (Post-UTME) Chemistry 2019 Objective paper, with the correct answer and a full explanation.
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A copper voltameter is set up with a copper cathode and an anode of carbon. A current of 4 amperes is passed through the voltameter for 2 hours. The mass of copper deposited during this period is
- A. 6.96 g
- B. 7.60 g
- C. 8.76 g
- D. 9.50 gCorrect
Explanation
Q=It=4x7200=28800C. Moles Cu = Q/(zF) = 28800/(2x96500) = 0.149mol. Mass = 0.149x64 = 9.5g.
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