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Which one of the following combinations of reagents will result in a spontaneous reaction?
A) Al(s) + CuCl2(aq)
B) Al(s) + CaCl2(aq)
C) Zn(s) + CaCl2(aq)
D) Cu(s) + ZnCl2(aq)

I know the answer is A, but what I don't know is why, or how to figure this out. Thanks!

  • Chemistry -

    Look at the activity series of metals.
    A metal will displace an ION below it in the activity series. And that is a spontaneous reaction.
    For example, Zn metal will displace Cu^+2 ion in the reaction
    Zn + CuCl2 ==> Cu + ZnCl2

    But a metal will NOT displace the ION of a metal above it in the activity series.
    CuCl2 + Zn ==> no reaction.

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