CMC Medical
CMC-Medical Ludhiana Solved Paper-2014
question_answer
The standard reduction potential,\[E{}^\circ \]for the half-reactions are as \[Zn\,\,\,\,Z{{n}^{2+}}+2{{e}^{-}};\] \[E{}^\circ =+\,0.76\,V\] \[Fe\,\,\,\,F{{e}^{2+}}+2{{e}^{-}};\]\[E{}^\circ =+\,0.41\,V\] The \[E_{cell}^{\text{o}}\] for the cell formed by these two electrodes is
A) - 0.35 V
B) - 1.17 V
C) + 0.35 V
D) + 1.17 V
Correct Answer:
C
Solution :
In this reaction, \[EMF={{E}_{cathode}}-{{E}_{anode}}\] \[=-\,0.41-(-0.76)=+\,0.35\,V\]