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The reduction potential of hydrogen half cell will be negative if

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$p (H_{2}) = 2 atm and [H^{+}] = 1.0 M$

$p (H_{2}) = 1 atm and [H^{+}] = 1.0 M$

$p (H_{2}) = 2 atm and [H^{+}] = 2.0 M$

$p (H_{2}) = 1 atm and [H^{+}] = 2.0 M$

answer is B.

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E_red will only be negative when $P_{H_{2}} > [H^{+}]$

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