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Faraday's First Law

How many fara...

Question

How many faradays of electricity will be required to completely electrolyse one mole of molten $A l_{2} O_{3}$ to produce $A l$ metal and $O_{2}$ gas?

1 F

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2 F

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3 F

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4 F

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Solution

The correct option is B 3 F
$A l_{3} + 3 e^{-} - \to A l$
3F are required for 1 mole. So 3F will produce 1 mole.

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