Question

# Which of the following statements are correct regarding the process of electrolysis of water?

A
H+ ions move towards the cathode.
B
OH ions move towards the anode.
C
Oxygen gas evolves at the cathode.
D
Hydrogen gas evolves at the cathode.

Solution

## The correct options are A H+ ions move towards the cathode. B OH− ions move towards the anode. D Hydrogen gas evolves at the cathode.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)+2e−→H2(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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