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Question
A gas X at 1 atm is bubbled through a solution containing a mixture of 1 MY− and 1 MZ− at 25°C. If the reduction potential of Z > Y > X, then ______.
Options
Y will oxidise X and not Z
Y will oxidise Z and not X
Y will oxidise both X and Z
Y will reduce both X and Z
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Solution
A gas X at 1 atm is bubbled through a solution containing a mixture of 1 MY− and 1 MZ− at 25°C. If the reduction potential of Z > Y > X, then Y will oxidise X and not Z.
Explanation:
A species can oxidise another if it has a higher reduction potential.
\[\ce{E^{\circ}_{Z} > E^{\circ}_{Y} > E^{\circ}_{X}}\]
So, Y− can oxidise X (since Y has a higher reduction potential than X), but cannot oxidise Z, because Z has an even higher reduction potential than Y. Hence, Y will oxidise X and not Z.
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