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Olympiad workbook

Exam: Olympiad workbook
Subject: NSEC
Chapter: Electrochemistry

Olympiad workbook · NSEC · Electrochemistry

Reaction E_0 / V Agarrow Ag^ + + ^ - -0.80 Cr^ 3+ +3 ^ - arrow 3 Cr...

Reaction	$E_0 / V$
$Ag\rightarrow Ag^{+}+\mathrme^{-}$	-0.80
$Cr^{3+}+3 \mathrme^{-}\rightarrow 3 Cr$	-0.74
$Zn^{2+}+2 \mathrme^{-}\rightarrow Zn$	-0.76
$I_2(~s)+2 \mathrme^{-}\rightarrow 2$ \mathrm{I} $^{-}$	$0.54$
$Co^{2+}+2 \mathrme^{-}\rightarrow Co$	$-0.28$
$Ni^{2+}+2 \mathrme^{-}\rightarrow Ni$	-0.26

\mathrm{E}^0

of the given cell is

\begin{array}{l|l||l|l}Ni & \left(\mathrm{Ni}^{+2},1.0 \mathrm{M}\right)& \left(\mathrm{Co}^{+2},1.0 \mathrm{M}\right)& Co\end{array}

Options

A $+0.02 \mathrm{~V}$
B $-0.02 \mathrm{~V}$
C $-0.54 \mathrm{~V}$
D $+0.54 \mathrm{~V}$

Correct answer

B. $-0.02 \mathrm{~V}$

Step-by-step solution

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