Post-UTME Chemistry 2015 Objective — Question 3
Question 3 of 20 from the Post-UTME Screening (Post-UTME) Chemistry 2015 Objective paper, with the correct answer and a full explanation.
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Which of the following results is obtained during the electrolysis of dilute tetraoxosulphate (IV) acid is using platinum electrodes?
- A. H2 is at the anode while O2 is at the cathode at volume ratio 1:2
- B. O2 is at the anode while H2 is at the cathode at volume ratio 1:2Correct
- C. O2 is the anode while H2 is at the cathode at volume ratio 1:1
- D. H2 is at the anode while O2 is at the cathode at volume ratio 1:1
Explanation
In electrolysis of acidified water, hydrogen (2 volumes) is liberated at the cathode and oxygen (1 volume) at the anode, giving O2:H2 = 1:2.
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