Which of the following reactions occur spontaneously, and which can be brought about only through electrolysis, assuming that all reactants and products are in their standard states? For those requiring electrolysis, what is the minimum voltage required?

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(a) 2 H₂O(1) 2 H₂(g) (b) Zn(s) + Fe²+ (aq) → (c) 2 Fe²+ (aq) + I₂(s) (d) Cu(s) + Sn+ (aq) + O₂(g) [in 1 M H*(aq)] 2+ Zn²+ (aq) + Fe(s) 3+ 2 Fe³+ (aq) + 21 (aq) Cu²+ (aq) + Sn²+ (aq)