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23 July, 20:25

Which metal will spontaneously react with Zn2+

(aq),

but will not spontaneously react with Mg2+

(aq)

according to the activity series

+1
Answers (1)
  1. 23 July, 20:28
    0
    The options of the question is not given so the options are;

    (1) Mn (s)

    (2) Cu (s)

    (3) Ni (s)

    (4) Ba (s)

    Answer: Mn (s)

    Explanation:

    The spontaneous reaction depends on the Eo value. The positive Eo value are spontaneous and the negative Eo values are not spontaneous.

    so, here the Eo values are:

    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

    Whereas, 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 because it has a positive Eo value and Zn2 + (aq), but will not spontaneously react with Mg2 + (aq) because it has negative Eo value.
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