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^{-}} $ .
