In H 2- O 2 fuel cell the reaction occuring at cathode is-A- 2 H 2 g - O 2 g - 2 H 2 O -B- O 2 g -2 H 2 O -4 e - 4 OH - aq C- H - aq - OH aq - H 2 O -D- H - e - 1 - 2 H 2

The correct option is B O2(g)+2H2O(ℓ) + 4e →4 OH (aq) O_2 (g) + 2H_2O (ℓ) + 4e^ → 4 OH^ (aq) ...

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Ion Electron Method

In H 2- O 2 f...

Question

In $H_{2} - O_{2}$ fuel cell the reaction occuring at cathode is:

2H₂(g)+O₂(g)→2H₂O(ℓ)

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O₂(g)+2H₂O(ℓ) + 4e^- →4 OH^-(aq)

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H⁺+ e^- → 1/2 H2

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H⁺(aq)+ OH(aq)→ H₂O(ℓ)

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Solution

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H_{2} - O_{2}

In H₂ - O₂ fuel cell the reaction occuring at cathode is :

O_{2} (g)

⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ \begin{matrix} (c o r r e c t) C u (s) ⟶ & C u^{2 +} (a q) + 2 e^{-} E_{C u | C u^{2 +}}^{⊝} = - 0.34 V (w r o n g) 2 H_{2} O (l) ⟶ & O_{2} (g) + 4 H^{\oplus} (a q) + 4 e^{-} E_{H_{2} O | O_{2}}^{⊝} = - 1.23 V \end{matrix} ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦

\begin{matrix} I n (d) \end{matrix}

⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ \begin{matrix} (c o r r e c t) N i (s) ⟶ & N i^{2 +} (a q) + 2 e^{-} E_{N i | N i^{2 +}}^{⊝} = - 0.25 V (w r o n g) 4 ⊝ O H (a q) ⟶ & O_{2} (g) + 2 H_{2} O (l) + 4 e^{-} E_{⊝ O H | O_{2}}^{\oplus} = - 0.4 V \end{matrix} ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦

H_{2} (g)

O_{2} (g)

O_{2} (g) + 2 H_{2} O (l) + 4 e^{-} \to 4 O H^{-} (a q)

H_{2} (g) + 2 O H^{-} (a q) \to 2 H_{2} O (l) + 2 e^{-}

4.48 L

H_{2}

1 atm

273 K

9650 sec

H_{2} (g)

O_{2} (g)

O_{2} (g) + 2 H_{2} O (l) + 4 e^{-} \to 4 O H^{-} (a q)

H_{2} (g) + 2 O H^{-} (a q) \to 2 H_{2} O (l) + 2 e^{-}

4.48 L

H_{2}

1 atm

273 K

9650 sec

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