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potassium
Zn(s)-> Zn2+(aq)+2e- and Ni2+(aq) + 2e- ->Ni(s)
Zn2+ + 2e- <--> Zno -0.7618 V
It can be, but it can also be other types of reaction. An example of an oxidation reaction that is also a single replacement would be Zn(s) + 2HCl ==> ZnCl2 + H2. In this reaction Zn is oxidized and H is reduced.
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Zn^2+ + 2e- ––> Zn(s)
potassium
Zn(s)-> Zn2+(aq)+2e- and Ni2+(aq) + 2e- ->Ni(s)
The reaction is: Zn + 2HCl = ZnCl2 + H2
MgCl2 aq plus Zn s is the oxidation half-reaction for Mg s plus ZnCl2 aq.
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The reaction Zn + CuCl2 --> Cu + ZnCl2 is a single-replacement reaction.
Zn(s) --> Zn2+(aq) + 2e : Oxidation Cu+(aq) + 1e --> Cu(s) : Reduction