A solution of Sodium Sulphate was electrolyzed using some inert electrode; the products at the electrodes are:
Correct answer: A. O2, H2
- A. O2, H2
- B. O2, Na
- C. O2, SO2
- D. O2, S2O4-2
Explanation
Keeping in mind the electrochemical series; OH- gets discharged at the anode whereas H+ gets discharged at the cathode giving out O2 and H2 gases. Hence only option A is correct. Na is above Hydrogen whereas SO2 and S2O42- are above OH- so these cannot be discharged at the electrodes making options B, C and D wrong or incorrect.
This question appeared on the HEC Phase I 2017 paper, which you can sit online with every answer explained.
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About Redox Reactions
Redox reactions involve oxidation and reduction occurring together, with electrons transferred between species or oxidation numbers changing. The topic covers assigning oxidation states, identifying oxidizing and reducing agents, balancing redox equations by oxidation number or half-reaction methods, and connecting chemical changes with galvanic and electrolytic cells.
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