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The reduction potential of hydrogen electrode will be positive if
$P_{H_{2}} = 2 a t m; [H^{+}] = 1 M$
$P_{H_{2}} = 2.5 a t m; [H^{+}] = 1.5 M$
$P_{H_{2}} = 2.5 a t m; [H^{+}] = 1 M$
$P_{H_{2}} = 1 a t m; [H^{+}] = 2 M$

A

P_{H_{2}} = 2.5 a t m; [H^{+}] = 1 M

B

P_{H_{2}} = 1 a t m; [H^{+}] = 2 M

C

P_{H_{2}} = 2 a t m; [H^{+}] = 1 M

D

P_{H_{2}} = 2.5 a t m; [H^{+}] = 1.5 M

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