Non standard cell conditions

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How can changing the position of half cell equilibrium change the cell potential? This question is taken from the OCR A 2014 F325 exam paper.

[@abdelwahaposman8614]

I find this so helpful despite being an AQA student. Thank you very much for your time. Please could you explain oxidising agents and reducing agents and how to find them on the electrochemical series. I always get those questions wrong - they never seem to stick in my head. Thank you.