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The emf of the cathode in the zinc-air batteries is __________

(a) 0.1V

(b) 0.2V

(c) 0.3V

(d) 0.4V

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Right option is (d) 0.4V

Easiest explanation: The electromotive force of the cathode of the zinc-air batteries is 0.4V. The cathode has the positive potential and the oxygen acts as the cathode.

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