Post-UTME Chemistry 2017 Objective — Question 1
Question 1 of 20 from the Post-UTME Screening (Post-UTME) Chemistry 2017 Objective paper, with the correct answer and a full explanation.
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What is quantity of iron is deposited when a current of 5A is passed through a solution containing Fe3+ ions for 19.3 minutes? [Fe=56, F=96,500C mol-1]
- A. 0.56g
- B. 1.12gCorrect
- C. 2.24g
- D. 3.36g
Explanation
Q=It=5x(19.3x60)=5790C. Fe3+ + 3e -> Fe, so moles=Q/(3F)=5790/(3x96500)=0.02mol. Mass=0.02x56=1.12g.
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