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14 April, 02:27

Which metal will spontaneously react with Zn2 + (aq), but will not spontaneously react with Mg2 + (aq) ?

(1) Mn (s) (2) Cu (s)

(3) Ni (s) (4) Ba (s)

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Answers (2)
  1. 14 April, 02:29
    0
    Correct Answer: option (1) Mn (s)

    Reason:

    The spontaneity of electrochemical cell, depends on the it's Eo value. Electrochemical cells with positve Eo are spontanous and vice-versa.

    In present case, the Eo of half-cell of interest are as follows:

    Eo Zn2+/Zn = - 0.763v

    Eo Mg2+/Mg = 2.37v

    Eo Mn2+/Mn = - 1.18v

    Therefore, Eo cell (with Zn as one of the half-cell) = Eo Zn2+/Zn - Eo Mn2+/Mn

    = - 0.763 - (-1.18)

    = 0.417v

    On other hand, Eo cell (with Mg as one of the half-cell) = Eo Mg2+/Zn - Eo Mn2+/Mn

    = - 2.37 - (-1.18)

    = - 1.19v

    Thus, Mn (s) metal will spontaneously react with Zn2 + (aq), but will not spontaneously react with Mg2 + (aq)
  2. 14 April, 02:34
    0
    This refers to a displacement reaction so we simply look at what can displace Zinc and not Magnesium so it will be Barium which is more reactive than Zinc but less reactive than Magnesium.
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