devarshi-dt-logo

Question:

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

22 kg

9 kg

27 kg

18 kg

Solution:

WCa/ECa = WAl/EAl
=> 40/20 = WAl/9
=> WAl = 18 kg
As current efficiency is 50%, the actual amount of aluminium produced will be 18 kg * 0.5 = 9 kg