Which reaction will occur if each substance is in its standard state?

Question

(A) Ni2+ will oxidize Sn2+ to give Sn4+
(B) Sn4+ will oxidize Br– to give Br2
(C) Br2 will oxidize Ni(s) to give Ni2+
(D) Ni2+ will oxidize Br2 to give Br–

Answer 1

I don't know how to do these except to look up the reduction potentials in a table and compare. What do you havae the text or your notes, or what are you covering, that will answer these?