The unfavourable electrochemical reaction amo | vedclass

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Question

(C) An electrochemical reaction is unfavourable if the standard cell potential $(E^0_{cell})$ is negative,which corresponds to a non-spontaneous react

Vedclass · Accepted Answer

$KCl + I_2 	o KI + Cl_2$

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(C) An electrochemical reaction is unfavourable if the standard cell potential $(E^0_{cell})$ is negative,which corresponds to a non-spontaneous reaction.In option $C$,the reaction is $2KCl + I_2 	o 2KI + Cl_2$.Chlorine $(Cl_2)$ is a stronger oxidizing agent than iodine $(I_2)$ because it has a higher reduction potential.Therefore,$Cl_2$ can displace $I^-$ ions from $KI$,but $I_2$ cannot displace $Cl^-$ ions from $KCl$.Thus,the reaction $KCl + I_2 	o KI + Cl_2$ is non-spontaneous and unfavourable.

The unfavourable electrochemical reaction among the following is

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