Question

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 $50\%$?

• A. 22 kg
• B. 18 kg
• C. 9 kg
• D. 27 kg

Answer 1

Answer: (C)

9 kg

Answer 2

$\frac{W_{Ca}}{E_{Ca}}= \frac{W_{Al}}{E_{Al}}$ $\Rightarrow \frac{40}{20}=\frac{W_{Al}}{9}$ $\Rightarrow W_{Al}=18\, kg$ As current efficiency is $50\%$ so, $W_{Al}= 9\, kg$