Redox Reactions And Electrochemistry Ques 149
Question: $ E^{o} $ values of $ M{g^{2+}}/Mg $ is $ -2.37V $ , of $ Z{n^{2+}}/Zn $ is $ -0.76V $ and $ F{e^{2+}}/Fe $ is $ -0.44,V $ . Which of the following statements is correct [EAMCET 1989]
Options:
A) $ Zn $ will reduce $ F{e^{2+}} $
B) $ Zn $ will reduce $ M{g^{2+}} $
C) $ Mg $ oxidises $ Fe $
D) $ Zn $ oxidises $ Fe $
Show Answer
Answer:
Correct Answer: A
Solution:
$ E_{Z{n^{++}}/Zn}^{o}<E_{F{e^{++}}/Fe}^{o} $ , so Zn will reduce $ F{e^{++}} $ . $ Zn $ cannot reduce $ M{g^{2+}} $ because $ E_{Z{n^{++}}/Zn}^{o}>E_{M{g^{++}}/Mg}^{o} $ On similar reason Mg and $ Zn $ cannot oxidize $ Fe $ .
