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  4. In a cell, the following reactions take place <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/chemistry/b30a30dd0125eab7f5cb19a4307fba4e-.png /> The standard electrode potential for the spontaneous reaction in the cell is x × 10-2 V 298 K. The value of x is (Nearest Integer)

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Q. In a cell, the following reactions take place
image
The standard electrode potential for the spontaneous reaction in the cell is $x \times 10^{-2} V\, 298\,K$. The value of $x$ is ______(Nearest Integer)

JEE MainJEE Main 2022Electrochemistry

Solution:

$\underset{\text { Cathode }}{ Fe ^{+3}}+\underset{\text { anode }}{ I ^{-}} \longrightarrow I _{2}+ Fe ^{+2}$
$E _{\text {Cell }}^{0}= E _{\text {cathode }}^{0}- E _{\text {anode }}^{0}$
$=0.77-0.54$
$=0.23$
$=23 \times 10^{-2} V$