Redox Reactions And Electrochemistry Ques 586
Question: Electrolysis of $ NaCl $ solution with inert electrodes for certain period of time gave $ 600cm^{3} $ of 1.0 M $ NaOH $ in the electrolytic cell. During the same period 31.80 g of copper was deposited in a copper voltmeter in series with the electrolytic cell. What is the percent current efficiency in the electrolytic cell- (At.wt. of Cu =63.6)
Options:
A) 40
B) 25
C) 60
D) 50
Show Answer
Answer:
Correct Answer: C
Solution:
[c] Moles of $ NaOH $ formed $ =\frac{600\times 1}{100}=0.6 $ or geq of $ NaOH=0.6 $ geq of Cu deposited $ =\frac{31.8}{63.6/2}=1.0 $
$ \therefore $ Current efficiency $ =\frac{0.6\times 100}{1}=60% $ %
