The standard electrode potentials of some electrodes are given below: {\Fe}^{3+} \/ {\Fe}^{2+} 0.77 {\V} ; {\Br}_2 \/ {\Br}^{-} 1.09 {\V}: {\I}_2 \/ {\I}^{-} 0.54 {\V} ; {\Zn}^{2+} \/ {\Zn}( { s})-0.76 {\V} \text{; } {\Ag}^{-} \/ {\Ag}( { s}) 0.80 {\V} ; {\Fe}^{2+} \/ {\Fe}( { s})-0.44 {\V}: {\Cu}^{2+} \/ {\Cu}( { s}) 0.34 {\V} Predict the reaction that is not feasible:

Correct Answer is : Ag( s) reduces Fe3+(aq)

{\Fe}^{3-} (aq) oxidises {\I}^{-}(aq)

{\Ag}^{-}(aq) oxidises {\Cu}( { s})

{\Ag}( { s}) reduces {\Fe}^{3+}( {\aq})

{\Br}_2 (aq) oxidises {\Fe}^{2+} (aq)

{\Zn}( { s}) reduces {\Cu}^{2+} (aq)

KEAM 2022 Physics and Chemistry Solved Paper

Question : 88 of 120

Marks: +1, -0

The standard electrode potentials of some electrodes are given below:
Fe3+∕Fe2+0.77V;Br2∕Br−1.09V:I2∕I−0.54V;Zn2+∕Zn( s)−0.76V‌; ‌
Ag−∕Ag( s)‌0.80‌V;Fe2+∕Fe( s)−0.44V:Cu2+∕Cu( s)‌0.34‌V
Predict the reaction that is not feasible:

Fe3− (aq) oxidises I−(aq)
Ag−(aq) oxidises Cu( s)
Ag( s) reduces Fe3+(aq)
Br2 (aq) oxidises Fe2+ (aq)
Zn( s) reduces Cu2+ (aq)

Validate

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