Which of the following statements applies during the electrolysis of sodium hydroxide solution using platinum electrodes?
- Na+ ions are discharged at the cathode
-
Hydrogen ions are discharged at the cathode
- the concentration of sodium hydroxide decrease at both electrode compartments
- the concentration of sodium hydroxide increases at the cathode only
- the concentration of sodium hydroxide increases at the anode only
The correct answer is: B
Explanation
Electrolysis of conc NaOH using platinum elcetrodes:
At the cathode, Hydrogen gas is evolved
at the anode, Oxygen gas is evolved.