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A factory produces 40 kg of calcium in two hours by electrolysis. How much aluminium can be produced by same current in 2 hours if current efficiency is 50%?

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22 kg

18 kg

9 kg

27 kg

answer is C.

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Detailed Solution

According toFaraday's II law

$\frac{W_{C a}}{E_{C a}} = \frac{W_{A l}}{E_{A l}} \frac{40}{20} = \frac{W_{A l}}{9} W_{A l} = 18 g$

As the currnet efficiency is 50%, W_Al = 9 g

proprotionally , W_Al= 9kg

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