JAMB Chemistry 2020 Objective — Question 31
Question 31 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2020 Objective paper, with the correct answer and a full explanation.
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31. A man suspected of being drunk was made to pass his breath into acidified potassium dichromate solution. If his breath carries a significant level of ethanol, the final colour of the solution is
- A. A. pink
- B. B. purple
- C. C. orange
- D. D. greenCorrect
Explanation
Ethanol reduces the orange acidified potassium dichromate(VI) to green Cr3+ ions, so a positive breath test turns the solution green.
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