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In a concentracttion cell:

1. two electrodes are of difference elements
2. two electrolytic solutions of the same electrolyte but having different concentrations are used
3. electrolyte of one strength but electrodes of two different concentrations are used
4. both (b) and \( (c) \)

Correct answer: two electrolytic solutions of the same electrolyte but having different concentrations are used

Solution

A concentration cell works because the same electrolyte is present at different concentrations in the two half-cells, creating a potential difference. The electrodes are typically identical; the driving force is the concentration gradient, not different electrode materials.

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