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

  • question_answer
    Standard cell voltage for the cell \[Pb|P{{b}^{2+}}||S{{n}^{2+}}\] is - 0.01 V. If the cell is to exhibit \[{{E}_{cell}}=0\], the value of \[[S{{n}^{2+}}]/[P{{b}^{2+}}]\] should be antilog of-

    A) +0.3            

    B) 0.5  

    C) 1.5                               

    D) \[-0.5\]

    Correct Answer: A

    Solution :

    [a] Apply Nenst equation to the reaction \[Pb+S{{n}^{2+}}\to P{{b}^{2+}}+Sn\] \[{{E}_{cell}}=E{}^\circ +\frac{0.059}{2}\log \frac{[S{{n}^{2+}}]}{[P{{b}^{2+}}]}\] or  \[\log \frac{[S{{n}^{2+}}]}{[P{{b}^{2+}}]}=\frac{0.01\times 2}{0.059}=0.3(\therefore {{E}_{cell}}=0)\] or \[\frac{[S{{n}^{2+}}]}{[P{{b}^{2+}}]}=anti\log \,0.3\] 


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