In $H_2-O_2$ fuel cell,the reaction occurring at the cathode is:

  • A
    $2H_{2(g)} + O_{2(g)} \rightarrow 2H_2O_{(l)}$
  • B
    $O_{2(g)} + 2H_2O_{(l)} + 4e^- \rightarrow 4OH^{-}_{(aq)}$
  • C
    $H^{+} + e^- \rightarrow \frac{1}{2}H_2$
  • D
    $H^{+}_{(aq)} + OH^{-}_{(aq)} \rightarrow H_2O_{(l)}$

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