The reduction potential of hydrogen electrode will be positive if

p (H_{2}) = 1 a t m, [H^{+}] = 1 M

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p (H_{2}) = 1 a t m, [H^{+}] = 2 M

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p (H_{2}) = 2 a t m, [H^{+}] = 1 M

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p (H_{2}) = 2.5 a t m, [H^{+}] = 1.5 M

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Solution

The correct option is B $p (H_{2}) = 1 a t m, [H^{+}] = 2 M$
$E_{\frac{H^{+}}{H_{2}}} = \frac{\frac{- R T}{F}}{n} \frac{p (H_{2})^{\frac{1}{2}}}{[H^{+}]}$
$p (H_{2})$ = 1 atm
And $[H^{2}]$ = 2M will make E positive.

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