In the electrolysis of dilute sulphuric acid using platinum electrodes…
In the electrolysis of dilute sulphuric acid using platinum electrodes, the products obtained at the anode and cathode are:
Now for the right answer to the above question:
- Option A is incorrect. yes, hydrogen will be discharged at the cathode, but sulphur will not in any way be discharged at the anode.
- Option B is incorrect. oxidation occurs at the anode, and reduction occurs at the cathode. This means, electronegative ions will be discharged at the anode, while electropositive ions will be discharged at the cathode. In this option, the reverse is the case.
- C is correct. Oxygen will be preferentially discharged at the anode, while hydrogen will be discharged at the cathode.
- D is not the correct answer.
You may please note these/this:
- Always remember that oxidation often occurs at the anode, while reduction often occurs at the cathode during electrolysis.
- Electronegative elements like oxygen, and chlorine must always be discharged at the anode and never at the cathode.
- Electropositive elements like hydrogen, copper, silver, mercury, aluminum, and other metals must always be discharged at the cathode and never at the anode.
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/ culled from 2017 JAMB-UTME Chemistry question 14 /
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