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Longest Chain Rule

In H 2- O 2 f...

Question

In $H_{2}$ - $O_{2}$ fuel cell with 60% efficiency, 5 moles of $H_{2} O$ is formed.What will be the number of faradays of electricity produced?

12F

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120F

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Solution

The correct option is C
6F

1mole of $H_{2} O$ = 2F

5 moles = 10F ;(with 60% efficiency) = 6F

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A fuel cell is:

I.A voltaic cell in which continuous supply of fuels are sent at anode to perform oxidation.

II. A voltaic cell in which fuels such as :

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III. One which involves the reaction of $H_{2} O_{2}$ fuel cell such as:

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Cathode : $O_{2} + 2 H_{2} O (l) + 4 e^{-} \to 4 ⊖ O H$

IV. The efficiency of $H_{2} - O_{2}$ fuel cell is $70$ to $75 %$ .

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If 9g of H₂O is electrolysed completely with 50% current efficiency, then how much O2 will be formed at STP?

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