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VMMC VMMC Medical Solved Paper-2011

  • question_answer
    A current of 12 A is passed through an electrolytic cell containing aqueous \[NiS{{O}_{4}}\] solution. Both Ni and \[{{\text{H}}_{2}}\]gas are formed at the cathode. The current efficiency is 60%. What is the mass of nickel deposited at the cathode per hour?

    A) 7.883 g                 

    B) 3.941 g 

    C)         5.91 g                  

    D)  2.645 g

    Correct Answer: A

    Solution :

    \[N{{i}^{-}}+2{{e}^{-}}\to Ni\] (at cathode) Equivalent weight of \[\text{Ni =}\frac{\text{mol}\text{.wt}\text{.}}{\text{no}\text{.of}\,\text{electrons}\,\text{gained}}\] \[\text{=}\frac{58.7}{2}\] \[=29.35\] \[i=12A,\,t=1\,h=60\times 60\,s,\] \[Z=\frac{Eq.wt.}{96500}\] Weight of Ni deposited \[\text{=}\frac{\text{Zit}\,\text{ }\!\!\times\!\!\text{ }\,\text{efficiency}}{\text{100}}\]               \[\text{=}\frac{29.35\times 12\times 60\times 60\times 60}{96500\times 100}\] \[=7.883\,g\]


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