During the electrolysis of aqueous KNO3, H2 is produced at cathode instead of potassium due to:
Correct answer: C. Reduction potential of potassium is less than hydrogen
- A. Reduction potential of "K" is greater than hydrogen
- B. Hydrogen is more reactive than potassium
- C. Reduction potential of potassium is less than hydrogen
- D. All of the above are possible reassons
Explanation
Reduction potential of potassium is less than hydrogen. H+ will be reduced instead of K+ at cathode and hydrogen gas is produced.K+ + le-1→ K E°=-2.92V2H+1 +2e-1→ H2 E°=0.00V
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Electrochemistry
Electrochemistry describes electron transfer through oxidation and reduction, identifies oxidizing and reducing agents, and applies oxidation numbers to balance redox equations. It also covers electrode potential and the standard hydrogen electrode, which provides the reference for comparing the reduction tendencies of other electrodes.
Practise Electrochemistry
696 free Electrochemistry MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Electrochemistry questions
The electrolysis product of molten NaCl at electrodes:
The reactions taking place at anode and cathode are respectively:
In which of the following changes there is a transfer of two electrons?
The cathodic reaction in the electrolysis of dil H2SO4 with Pt electrodes:
The product produced at the cathode when aqueous sodium chloride is electrolyzed:
For the purification of copper, impure copper is made the: