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
H+-e-→12H2
Apply Nernst equation
E=0-0.0591logPH212H+
E=-0.0591log2121
Therefore E is Negative
The percentage of nitrogen in the air is about
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