Redox Reactions And Electrochemistry Ques 231

Question: Which one of the following metals could not be obtained on electrolysis of aqueous solution of its salts [IIT 1990]

Options:

A) $ Ag $

B) $ Mg $

C) $ Cu $

D) $ Cr $

Show Answer

Answer:

Correct Answer: B

Solution:

The reduction potential of $ Mg $ is less than that of water $ (E^{o}=-0.83V) $ . Hence their ions in the aqueous solution cannot be reduced instead water will be reduced $ 2H_2O+2{e^{-}}\to H_2+2O{H^{-}} $ .



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