The reduction potential of hydrogen half-cell will be negative if:
Correct answer: C. p(H2)=2 atm and [H+] = 1M
- A. p(H2)=1 atm and [H+]=1M
- B. p(H2)=2 atm and [H+] = 2M
- C. p(H2)=2 atm and [H+] = 1M
- D. p(H2)=1 atm and [H+]= 2M
Explanation
According to the Nernst equation, the reduction potential of a half-cell is affected by the concentration of ions and the partial pressure of gases involved. For a hydrogen half-cell, the standard reduction potential is zero at 1 atm pressure and 1M concentration of H+. Option C presents a scenario where the partial pressure of hydrogen is increased to 2 atm while maintaining the standard concentration of H+. This results in a shift in equilibrium towards oxidation, causing the reduction potential to become negative. In contrast, Option A describes standard conditions resulting in zero potential, Option B could have a balanced effect maintaining the potential near zero, and Option D increases the concentration of H+ which would increase the reduction potential, making it positive.
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
In the electrochemical cell, cd + Sn+4 -> cd+2 + Sn+2Increase in the concentration of Sn+2:
A certain metal salt solution is electrolysed in series with a silver coulometer. The weights of silver and the metal deposited are 0.5094 g and 0.2653 g. Calculate the valency of the metal if its atomic weight is nearly that of silver.
Zn amalgam is prepared by electrolysis of aqueous ZnCl2 using Hg cathode (9 gm). How much current is to be passed through ZnCl2 solution for 1000 seconds to prepare a Zn amalgam with 25% Zn by wt. (Zn = 65.4)
Na amalgam is prepared by electrolysis of NaCl solution using liquid Hg as cathode. How long should the current of 10 amp. is passed to produce 10% Na − Hg on a cathode of 10 gm Hg. (atomic mass of Na = 23).
Calculate the quantity of electricity that would be required to reduce 12.3 g of nitrobenzene to aniline if current efficiency is 50% and the potential drop across the cell is 3.0 volts.
When electric current is passed through an ionic hydride in the molten state: