For the cell Zn(s)|Zn^ 2+ (aq) \| M^ x+ (aq)| M(s), different half cells and their standard electrode potentials are given below: If E_ Zn^ 2+ / Zn^ =-0.76 V, which cathode will give a maximum value of E_ cell ^ 0 per

Correct answer: A. Ag^ + / Ag Zn+2 Ag^ + 2 Ag+Zn^ 2+ (n=2 e^ - ) =0.80-(-0.76)=1.56 ~V for 2 e E_ cell ^ for 1 e^ - =(1.56)/(2)=0.78 ~V

JEE Main 201911 JanuaryMorning Shift

JEE Main 2019 · 11 January · Morning Shift · Chemistry · Electrochemistry

For the cell Zn(s)|Zn^ 2+ (aq) \| M^ x+ (aq)| M(s), different half...

For the cell

\mathrm{Zn}(\mathrm{s})\left|\mathrm{Zn}^{2+}(\mathrm{aq}) \| \mathrm{M}^{\mathrm{x}+}(\mathrm{aq})\right| \mathrm{M}(\mathrm{s}),

different half cells and their standard electrode potentials are given below: If

\mathrm{E}_{\mathrm{Zn}^{2+} / \mathrm{Zn}^{\circ}=-0.76 \mathrm{ V},

which cathode will give a maximum value of

E_{

\text{cell }^{0}

per electron transferred?

A. $\mathrm{Ag}^{+} / \mathrm{Ag}$

\mathrm{Zn}+2 \mathrm{Ag}^{+} \longrightarrow 2 \mathrm{Ag}+\mathrm{Zn}^{2+}\left(n=2 e^{-}\right) =0.80-(-0.76)=1.56 \mathrm{~V}

for

2 e \therefore \mathrm{E}_{\text{cell }}^{\circ}

for

1 e^{-}=\frac{1.56}{2}=0.78 \mathrm{~V}