Q.

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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answer is 3.

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Detailed Solution

Number of equivalents of Ca produced = massEq.wt=40×10-320=2×10-3 mass of Al produced =% current efficiency 100×number of equivalents×Eq.wt =50100×2×9=9 kg
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