Redox Reactions And Electrochemistry Ques 150
Question: The standard reduction potential for $ F{e^{2+}}/Fe $ and $ S{n^{2+}}/Sn $ electrodes are $ -0.44 $ and $ -0.14 $ volt respectively. For the given cell reaction $ F{e^{2+}}+Sn,\to Fe+S{n^{2+}} $ , the standard EMF is [IIT Screening 1990; MP PMT 2003]
Options:
A) + 0.30 V
B) - 0.58 V
C) + 0.58 V
D) - 0.30 V
Show Answer
Answer:
Correct Answer: D
Solution:
For the cell reaction, Fe acts as cathode and Sn as anode. Hence, $ E_{cell}^{o}=E_{Cathode}^{o}-E_{Anode}^{o} $ = - 0.44 - (- 0.14)= - 0.30V The negative EMF suggests that the reaction goes spontaneously in reversed direction.
