JAMB Biology 2015 Objective — Question 36
Question 36 of 50 from the Joint Admissions and Matriculation Board (JAMB) Biology 2015 Objective paper, with the correct answer and a full explanation.
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The mass of copper deposited when a current of 2.0A is passed through a solution of a copper salt for 60 minutes is [Cu=64, F=96500 Cmol⁻¹]
- A. 4.78g
- B. 0.04g
- C. 2.39gCorrect
- D. 9.55g
Explanation
Q=It=2×3600=7200C. For 1 mole Cu (64g), 2F (193000C) is required, so mass deposited = (64/193000)×7200 ≈ 2.39g.
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