Redox Reactions And Electrochemistry Ques 186

Question: The standard potential at $ 25^{o}C $ for the following half reactions are given against them $ Z{n^{2+}}+2e\to Zn,E^{o}=-0.762V $ $ M{g^{2+}}+2e\to Mg,E^{o}=-2.37V $ When zinc dust is added to the solution of $ MgCl_2 $ [UPSEAT 2001]

Options:

A) $ ZnCl_2 $ is formed

B) Zinc dissolves in the solution

C) No reaction takes place

D) $ Mg $ is precipitated

Show Answer

Answer:

Correct Answer: C

Solution:

$ \overset{0}{\mathop{Zn}},+\overset{+2,}{\mathop{MgCl_2}},\to \overset{+2,}{\mathop{ZnCl_2}},+Mg $ No reaction This type of reaction does not occur because $ M{g^{2+}}E^{o}=-2.37V $ while $ Z{n^{2+}}E^{o}=-0.76V $ .



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