Question

The substance obtained at anode during the electrolysis of water is
a) hydrogen b) water vapourc) dilute sulphuric acid d) oxygen

Answer 1

Oxygen get floated on anode and co2 at cathode

Answer 2

Option D (Oxygen) is correct for this question.  

The positive charge of the electrode is called anode whereas the negative charge of the electrode is called cathode.

During the process of electrolysis, non-metal ions like oxide ions and chloride ions act as a cathode, so that gases such as oxygen is obtained at the positive charge of the electrode (anode).