In the electrolysis of aqueous potassium nitrate

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In the electrolysis of aqueous potassium nitrate using inert electrodes, which one of the following species is oxidized? 

Potassium ion

Nitrate ion

Water

Oxygen

Hydronium ion

Why is the answer water in this case? Wouldn't it be the nitrate ion since the potassium ion should be reduced to K from K+?

Reference no: EM131034318

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