Chemistry
JAMB 1979
Which of the following statements applies during the electrolysis of sodium hydroxide solution using platinum electrodes?
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A.
Na+ ions are discharged at the cathode
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B.
Hydrogen ions are discharged at the cathode
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C.
the concentration of sodium hydroxide decrease at both electrode compartments
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D.
the concentration of sodium hydroxide increases at the cathode only
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E.
the concentration of sodium hydroxide increases at the anode only
Correct Answer: Option B
Explanation
Electrolysis of conc NaOH using platinum elcetrodes:
At the cathode, Hydrogen gas is evolved
at the anode, Oxygen gas is evolved.
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