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BITSAT 2022

Exam: BITSAT
Year: 2022
Subject: Chemistry
Chapter: Electrochemistry

BITSAT 2022 · Chemistry · Electrochemistry

Using the standard electrode potential, find out the pair between...

Using the standard electrode potential, find out the pair between which redox reaction is not feasible.

E^{\ominus}

values

\mathrm{Fe}^{3+} / \mathrm{Fe}^{2+}=+0.77 ;

\mathrm{I}

_2 /

\mathrm{I}

^{-}=+054\mathrm{Cu}^{2+} / \mathrm{Cu}=+0.34 ; \mathrm{Ag}^{+} / \mathrm{Ag}=0.80 \mathrm{ V}

Options

A $\mathrm{Fe}^{3+}$ and $\mathrm{I}^{-}$
B $\mathrm{Ag}^{+}$ and $\mathrm{Cu}$
C $\mathrm{Fe}^{3+}$ and $\mathrm{Cu}$
DAg and $\mathrm{Fe}^{3+}$

Correct answer

D. Ag and $\mathrm{Fe}^{3+}$

Step-by-step solution

(a) This reaction is feasible, since

E_{\text{cell }^{{}^{\circ}}

is positive. (b) This reaction is feasible, since

E_{\text{cell }^{{}^{\circ}}

is positive. (c) This reaction is feasible, since

E_{\text{cell }^{{}^{\circ}}

is positive. (d) This reaction is not feasible, since

E_{\text{cell }^{{}^{\circ}}

is negative.

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