Redox Reactions And Electrochemistry Ques 566
Question: Which of the following will form a cell with the highest voltage-
Options:
A) $ 1,MA{g^{+}},1,MC{o^{2+}} $
B) $ 2M,A{g^{+}},2,MC{o^{2+}} $
C) $ 0.1,M,A{g^{+}},2,MC{o^{2+}} $
D) $ 2,M,A{g^{+}},0.1,MC{o^{2+}} $
Show Answer
Answer:
Correct Answer: D
Solution:
Oxidation potential of Co is more than Ag, hence cell reaction will be $ Co+2A{g^{+}}\xrightarrow{{}}C{o^{2+}}+2Ag $ $ E_{cell}=E_{cell}^{{}^\circ }-\frac{RT,ln[C{o^{2+}}]}{nF{{[A{g^{+}}]}^{2}}} $ , the lesser the value of the factor $ \frac{[C{o^{2+}}]}{{{[A{g^{+}}]}^{2}}} $ greater will be value of $ E_{cell}. $
