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(C) The reduction potential of an ion determines its ease of reduction at the cathode. Higher (more positive) reduction potential means easier reducti

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$(i)$ and (ii) both

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(C) The reduction potential of an ion determines its ease of reduction at the cathode. Higher (more positive) reduction potential means easier reduction.For pair $(i)$: The reduction potential of $H_2O$ $(-0.83 \ V)$ is higher than that of $Na^+$ $(-2.71 \ V)$. Thus,$H_2O$ is reduced more easily than $Na^+$.For pair (ii): The reduction potential of $H^+$ $(0.00 \ V)$ is significantly higher than that of $Na^+$ $(-2.71 \ V)$. Thus,$H^+$ is reduced more easily than $Na^+$.Since both pairs contain a species that is reduced more easily than $Na^+$,both $(i)$ and (ii) represent pairs where one species is reduced more easily at the cathode.

Which of the following pairs has easier reduction at the cathode?

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