Under standard-state conditions, which of the following half-reactions occurs at the cathode during the electrolysis of aqueous nickel sulfate at 25°c?
a. 2h2o ? o2 + 4h+ + 4e–
b. ni2+ + 2e– ? ni
c. 2h2o + 2e– ? h2 + 2oh–
d. ni ? ni2+ + 2e–

The following reaction will occur at cathode:

Explanation:

The two half reaction during electrolysis of aqueous nickel sulfate will be

a) anode reaction :

Water will undergo oxidation and will evolve oxygen gas at anode as shown in the given reaction:

b) Cathode reaction: The reduction of Nickel ion will occur by gain of two electrons as shown in the given equation:

Thus the overall reaction will be:

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