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WB JEE Medical WB JEE Medical Solved Paper-2007

  • question_answer
    A current of 12 ampere is passed through an electrolytic cell containing aqueous \[NiS{{O}_{4}}\] solution. Both Ni and \[{{H}_{2}}\]gas are formed at  the cathode. The current efficiency is 60%. What is the mass of nickel deposited on 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) \[Equivalent\,weight\,of\,Ni=\frac{mol.wt}{gain\,electron}\]                                                 \[=\frac{58.7}{2}\]                                                 \[=29.35\] \[i=12A,\,t=1h=60\times 60s,Z=\frac{Equ.wt.}{96500}\] \[Weight\text{ }of\text{ }deposite\text{ }Ni=\frac{Zit\,efficiency}{100}\] \[=\frac{29.35\times 12\times 60\times 60\times 60}{96500\times 100}\] \[=7.883\,g\]


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