Thermodynamics

  • Question
    CBSEENCH11008081

    The standard reduction potentials for Zn2+/ Zn, Ni2+/ Ni, and F2+/ Fe are –0.76, –0.23 and –0.44 V respectively. The reaction X + Y2+ → X 2+ + Y will be spontaneous when

    • X = Ni, Y = Fe

    • X = Ni, Y = Zn

    • X =Fe, Y= Zn

    • X = Zn, Y = Ni

    Solution

    D.

    X = Zn, Y = Ni

    X = Zn, Y = Ni
    Zn + Ni2+  →Zn2+ + Ni
    straight E subscript cell superscript straight o space equals space straight E subscript zn divided by zn to the power of 2 plus end exponent end subscript superscript straight o space plus space straight E subscript Ni to the power of 2 plus end exponent divided by Ni end subscript superscript straight o
space equals space 0.76 minus 0.23
space equals space 0.53 space straight V
straight E subscript cell superscript 0 space greater than thin space 0

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