Which one of the following reagents is capable of transforming Cu2+(1 M) to Cu(s)? (check my answer)?

Question

Which one of the following reagents is capable of transforming Cu2+(1 M) to Cu(s)?

a) I– (1 M)
b) Ni(s)
c) Al3+(1 M)
d) F– (1 M)
e) Ag(s)

I think its B, Nickel...can anyone confirm this?

Answer 1

You can definitely exclude c, since Al3+ cannot lose more electrons in order to reduce Cu(2+) to Cu(0)
As for the rest...
Cu(2+) will react with the reagent for which the standard reduction potential (E0) is smaller than the one for Cu(2+) +2e-> Cu(0).
Cu(2+) +2e -> Cu(0) E0=+0.3419 Volt
Ni(+2) + 2e -> Ni(0) E0=-0.257 Volt
I2 + 2e-> 2I- E0=+0.5355 Volt
F2+ 2e-> 2F- E0=+2.866 Volt
Ag(+) + e-> Ag E0=+0.799 Volt

So yes nickel is the correct answer
Values are from
http://www.northland.cc.mn.us/Chemistry/standard_reduction_potentials.htm

Answer 2

in case you spoke back all of them in the previous 12:00 AM a while, you may wait until eventually 12:00 AM. in case you spoke back all of them AFTER 12:00 AM a while, you may wait until eventually the subsequent 12:00 AM... aka sunday