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Chemistry · Dry cell and lead accumulator, fuel cells

Assertion fuel cell gives a constant voltage throughout its life. Reason In this

Assertion \( \boldsymbol{H}_{2}+\boldsymbol{O}_{2} \) fuel cell gives a constant voltage throughout its life. Reason In this fuel cell, \( H_{2} \) reacts with \( O H^{-} \) ions, yet the overall concentration of \( O H^{-} \) ions does not change

  • A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
  • B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
  • C. Assertion is correct but Reason is incorrect
  • D. Assertion is incorrect but Reason is correct

Step-by-step solution

In the H2-O2 alkaline fuel cell, the reactions are: Anode: 2H2 + 4OH- → 4H2O + 4e-; Cathode: O2 + 2H2O + 4e- → 4OH-. OH- ions are consumed at the anode and produced at the cathode at equal rates, so their concentration remains constant. The cell voltage depends on concentrations; constant concentration leads to a constant voltage (ideally). Hence, both statements are correct and the reason correctly explains the assertion.
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