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Question

Which gas is evolved at the anode during electrolysis of water?
  1. Hydrogen
  2. Nitrogen dioxide
  3. Sulphur dioxide
  4. Oxygen


Solution

The correct option is D Oxygen

During its electrolysis, the water molecule (H2O) undergoes decomposition to form H+ and OH ions.

The H+ ions move towards the cathode (negatively charged electrode) and thus hydrogen gas evolves there. The reaction occuring at cathode is:

2H2O (l)+2eH2(g)+2OH(aq)

The OH ions move towards the anode (positively charged electrode) and thus oxygen gas evolves there. The reaction occuring at anode is:

2H2O (l)O2 (g)+4H+(aq)+4e

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