Q. The reduction potential of hydrogen half-cell will be negative if :(1) PH2= 2 atm and [H+] = 2.0 M(2) PH2= 1 atm and [H+] = 2.0 M(3) PH2= 1 atm and [H+] = 1.0 M(4) PH2= 2 atm and [H+] = 1.0 M
A) Option 2
B) Option 1
C) Option 4
D) Option 3
✔ Correct Answer: Option 4
Exam Insight
The reduction potential of a hydrogen half-cell becomes negative if the hydrogen ion concentration decreases or the pressure of H2 gas increases. This is dictated by the Nernst equation.