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.



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