If the standard hydrogen electrode acts as a cathode, the reaction at cathode will be:

H⁺ (aq) + e^-→ H₂ (g)

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2H⁺ (aq) + 2e^-→ H₂ (g)

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H₂ (g) → 2H⁺ (aq) + 2e^-

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H₂ (g) → H⁺ (aq) + e^-

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Solution

The correct option is B
2H⁺ (aq) + 2e^-→ H₂ (g)

Reduction reaction takes place at cathode. So, a balanced reduction half reaction will be the reaction representation at cathode.

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Similar questions

If the standard hydrogen electrode acts as an anode, the reaction at anode will be:

A g^{+} / A g

0.80 V

A g^{+} / A g

E^{0}

Z n / Z n + 2, E^{0} = - 0.76 V

C u^{+ 2} / C u, E^{0} = + 0.34 V

A l / A l^{+ 3}, E^{0} = - 1.66 V

H g^{2 +} / H g, E^{0} = + 0.885 V

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