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At 25°C, a gas X at 1 atm is passed through a solution that contains both 1 M Y and M Z. If the standard reduction potentials satisfy Z > Y > X, which statement is correct?

1. Y will oxidize X but not Z
2. Y will oxidize Z but not X
3. Y will oxidize both X and Z
4. Y will reduce both X and Z

Correct answer: Y will oxidize X but not Z

Solution

A species oxidizes another only if its own reduction potential is higher. With Z > Y > X, Y has a higher reduction potential than X (so Y oxidizes X) but lower than Z (so Y cannot oxidize Z). Hence 'Y will oxidize X but not Z.'

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