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Calculate the EMF of the cell   Na/Na+1M//Mg+21M/Mg ;    Given ENa/Na+0=+2.71 V  and  EMg+2/Mg0=-2.37 V ;

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a

+5.08 V

b

-5.08 V

c

-0.34 V

d

+0.34 V

answer is D.

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Detailed Solution

SOP of Sodium electrode is given, change it to SRP. ENa+/Na0=-2.71 V and  EMg+2/Mg0=-2.37 V; Both are SRP values;From the cell notation ,Sodium electrode( LHE ) is the Anode,Magnesium electrode ( RHE ) is the Cathode,Ecell° =ECathode°-EAnode°=-2.37 V-(-2.71) V =+0.34 V
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Calculate the EMF of the cell   Na/Na+1M//Mg+21M/Mg ;    Given ENa/Na+0=+2.71 V  and  EMg+2/Mg0=-2.37 V ;