which of the following would reagents would oxidize Zn to Zn^2+, but not Fe to Fe3^+

a) Ca^2+

b)Br2

c)Co

d)Ca

e)Br^-

f)Co^2+

Which of the following reagents would oxidize Cu to Cu^2+, but not Au toAu^3+

a) Co^2+

b) Ca

c) Ca^2+

d) Br^-

e) Br2

f) Co

Please explain as well thanks.