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

  • question_answer
    How long a current of 3 amperes has to be passed through a solution of \[AgN{{O}_{3}}\] to coat a metal surface of \[80c{{m}^{2}}\] and 0.005 mm thick layer. Density of Ag is \[10.5\text{ }g\,c{{m}^{-3}}\]

    A) 125.1 seconds   

    B) 12.5 seconds

    C) 155.2 seconds   

    D) 200 seconds

    Correct Answer: A

    Solution :

    [a] \[Volume=Area\times thickness\] \[Mass=Volume\times density\] \[\therefore \] Mass of Ag to be deposited \[=\frac{80\times 0.005}{10}\times 10.5=0.42\text{ }g\] \[Amount\text{ }deposited=\frac{i\times t\times E.wt}{96500}\] \[\therefore 0.42=\frac{108\times 3\times t}{98500}\therefore t=125.1\,seconds\]


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