Which of the following redox reactions is spontaneous under standard conditions?
A.Zn (s) + Ca2+ (aq) Zn2+ (aq) + Ca (s)
B.Fe (s) + Mg2+ (aq) Fe2+ (aq) + Mg (s)
C. Zn (s) + Ni2+ (aq) Zn2+ (aq) + Ni (s)
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