The reduction potential of hydrogen half cell will be negative if

1
p(H2) = 1 bar and [H+] = 1M
2
p(H2) = 1 bar and [H+] = 2M
3
p(H2) = 2 bar and [H+] = 1M
4
p(H2) = 2 bar and [H+] = 2M

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