Question

What do oxidation reactions produce during the electrolysis of water? H2(g) H2O(l) O2(g) OH–(aq)

Answer 1

It will prodce O2 as the oxidation reaction as oxidation of O changes from -2 to 0 !!

So your answer is third one ; O2(g)

Answer 2

Answer: Oxidation reaction produces oxygen and water molecule during electrolysis of water.

Explanation:

Electrolysis of water is basically the decomposition of water into oxygen and hydrogen gas through a process of electric current.

Oxidation reaction is defined as the reaction in which a substance looses its electron to attain stability.

The chemical reactions during electrolysis of water are:

At cathode:  $2H_2O+2e^-\rightarrow H_2+2OH^-$

At anode:  $2OH^-\rightarrow \frac{1}{2}O_2+H_2O+2e^-$

Overall reaction:  $H_2O\rightarrow H_2+\frac{1}{2}O_2$

Oxidation reaction occurs at anode.

Hence, oxidation reaction produces oxygen and water molecule during electrolysis of water.