When will the cation not form during electrolysis?

Hydrogen is higher in reactivity series

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Hydrogen is lower in reactivity series

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Hydrogen is preferred due to its diatomic form

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Hydrogen is not necessary in brine

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Solution

The correct option is B
Hydrogen is lower in reactivity series

If the cation is a highly reactive metal, hydrogen is formed. The more reactive a metal, the greater tendency it has to form a positive ion. So in some cases the metals which are higher in reactivity series remain back in brine and hydrogen is allowed to form at electrode.

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Metals higher in the reactivity series replace hydrogen from its acid to form the corresponding hydroxides and hydrogen gas.

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