In the Electrolysis of Acidulated Water, - Fill in the Blank - Gas is Evolved at the Anode

In the electrolysis of acidulated water, oxygen gas is evolved at the anode.OH being negatively charged, moves towards the anode (positively charged electrode).

Ions present in solution are  and 
+ve charge moves towards cathode whereas -ve charge move towards the anode. Hence, during electrolysis of acidulated water, hydrogen is collected at cathode and oxygen is collected at the anode.

Reaction at the Anode,
OH – e + OH

OH + OH + H2O + O

O + O + O2

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