First slide

Activity Series (OR) Electro chemicals series

Question

Which one of the following process is not feasible in an aqueous solution

Moderate

A

$Cu + 2 AgN O_{3} \overset{}{\to} Cu {({NO}_{3})}_{2} + 2 Ag$
B

$F_{2} + 2 KCl \overset{}{\to} {Cl}_{2} + 2 KF$
C

$Zn + CuS O_{4} \overset{}{\to} {ZnSO}_{4} + Cu$
D

${Br}_{2} + 2 KF \overset{}{\to} 2 KBr + F_{2}$

Solution

Oxidising Power of $F_{2} > {Cl}_{2} > {Br}_{2} > I_{2}$
${Br}_{2}$ cannot oxidise $F^{-}$ ;
SRP values of
$E_{\frac{1}{2} F_{2} / F^{-}}^{0} > E_{\frac{1}{2} {Cl}_{2} / {Cl}^{-}}^{0} > E_{\frac{1}{2} {Br}_{2} / {Br}^{-}}^{0} > E_{{Ag}^{+} / Ag}^{0} > E_{{Cu}^{+ 2} / Cu}^{0} > E_{{Fe}^{+ 2} / Fe}^{0} > E_{{Zn}^{+ 2} / Zn}^{0}$ .

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