First slide

Electrochemical cells

Question

The oxidation potential of hydrogen half-cell will be negative if

Moderate

A

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

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

$p (H_{2}) = 0 .2 atm and [H^{+}] = 1 M$
D

$p (H_{2}) = 0 .2 atm and [H^{+}] = 0 .2 M$

Solution

H₂ $\to$ 2 H⁺ + 2 e
E_oxd= $E_{o x}^{0} - \frac{0.0529}{n} \log \frac{{[H^{+}]}^{2}}{P_{H_{2}}}$

$E_{o x}^{0} = 0$

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