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NEET Chemistry Electrochemistry / विद्युत् रसायन Question Bank Self Evaluation Test - Electrochemistry

  • question_answer
    Electrolysis of \[NaCl\] solution with inert electrodes for certain period of time gave \[600\text{ }c{{m}^{3}}\] 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)

    A) 40   

    B) 25   

    C) 60                                

    D) 50

    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 \[=\frac{0.6\times 100}{1}=60%\]%


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