Redox Reactions And Electrochemistry Ques 307
Question: An electrolytic cell contains a solution of $ Ag_2SO_4 $ and have platinum electrodes. A current is passed until 1.6 gm of $ O_2 $ has been liberated at anode. The amount of silver deposited at cathode would be [CPMT 1971]
Options:
A) 107.88 gm
B) 1.6 gm
C) 0.8 gm
D) 21.60 gm
Show Answer
Answer:
Correct Answer: D
Solution:
At cathode: $ A{g^{+}}+{e^{-}}\to Ag $
At Anode: $ 2O{H^{-}}\to H_2O+\frac{1}{2}O_2+2{e^{-}} $
$ E_{Ag}=\frac{108}{1}=108;{E_{O_2}}=\frac{\frac{1}{2}\times 32}{2}=8 $
$ \frac{W_{Ag}}{E_{Ag}}=\frac{{W_{O_2}}}{{E_{O_2}}} $ ;
$ W_{Ag}=\frac{1.6\times 108}{8}=21.6gm $ .
