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Which of the following redox reactions is spontaneous under standard conditions? A.Zn (s) + Ca2+ (aq)  Zn2+...

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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