Sketch a voltaic cell for each redox reaction. Label the anode and cathode and indicate the half-reaction that occurs at each electrode and the species present in each solution. Also indicate the direction of electron flow.

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2+ Ni(s) + Mg²+ (aq) H₂(g) + Fe²+ (aq) a. Ni²+ (aq) + Mg(s) b. 2 H+ (aq) + Fe(s) c. 2 NO3(aq) + 8 H+ (aq) + 3 Cu(s) 2 NO(g) + 4H₂O(l) + 3 Cu²+ (aq)