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As a final post before your O Level MCQ paper, I will be discussing a question on Electrolysis and Simple Cells. Consider the question as follows:-

 

electrolysis

 

The correct answer is C.

To solve this question, we first consider the set up on the right.

With Zinc as Y and Copper as Z –>

Zinc, being more reactive will lose electrons more readily. This causes it to act like a simple cell/battery.

 

Now, consider the set up on the left.

With both electrodes as copper, and with the simple cell on the right acting as a battery, X gains electrons and becomes the cathode. Copper ions are attracted to the cathode and discharged as copper metal!

 

This is a fairly interesting question as it  combines both simple cells and electrolysis into 1! I hope you found this useful. All the best for tomorrow!