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Statement-I: H(2)+O(2) fuel cell gives a...

Statement-I: `H_(2)+O_(2)` fuel cell gives a constant voltage throughout its life.
Because Statement-II: In this fuel cell, `H_(2)` reacts with `OH^(-)` ions yet the overall concentration of `OH^(-)` ions does not change.

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Why does mercury cell gives a constant voltage throughout its life ?

Assertion (A) : (H_(2)+O_(2)) fuel cell gives a constant voltages throughout its life. Reason (R): In this fuel cell, H_(2) reacts with overset(c-)(Oh)H ions, yet the over all [overset(c-)(O)H] does not change.

EMF of an H_(2)-O_(2) fuel cell

W.r.t. H_(2)-O_(2) fuel cell the correct statement is

In H_(2)-O_(2) fuel cell, the reaction occurring at cathode is

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