If electricity is passed through CuSO4 solution by using Pt electrode then which of the following possible change occurs ?
Correct answer: B. Colour of the solution becomes fade
- A. H2 is deposited at cathode
- B. Colour of the solution becomes fade
- C. Cu is deposited at anode
- D. All are possible
Explanation
At the cathode, Cu2+ is preferentially reduced to Cu, while at the platinum anode water is oxidised to oxygen; Cu2+ is therefore removed from solution and its blue colour fades. Students may choose hydrogen at the cathode by considering water reduction only, but Cu2+ is more readily discharged under these conditions.
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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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