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  • Consider the reaction  <img alt="2Ag ^+ + Cd \rightarrow 2Ag + Cd ^{2+}" src="http://entrancecorner.oncodecogs.com/gif.latex?2Ag%20%5E&plus;%20&plus;%20Cd%20%5Crightarrow%202

Consider the reaction 

2Ag ^+ + Cd \rightarrow 2Ag + Cd ^{2+}

The standard potential for 

\mathrm{Ag^+ \rightarrow\textup{ Ag and }Cd^{2+} \rightarrow Cd}  couples are 0.80 V and -0.40 V respectively Now ,

a) Standard potential E^0 for the cell is 1.20V 

b) Cd electrode is the negative electrode 

Which of the following statement is correct ? 

Option: 1

a


Option: 2

b


Option: 3

a,b


Option: 4

none


Answers (1)

best_answer

 E^0= E_{cathode}^{0}- E_{anode}^{0}

= 0.80 - (-0.04)= 1.20 V

The negative electrode is always the elctrode that has lower value of reduction potential 

\therefore Cd is negative electrode
Therefore,option(3) is correct

 

Posted by

chirag

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