Question

A factory produces $40kg$ 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. $22kg$
• B. $18kg$
• C. $9kg$
• D. $27kg$

Answer 1

The correct option is C $9kg$

$\frac{W_{Ca}}{E_{Ca}}=\frac{W_{Al}}{E_{Al}}$

$\Rightarrow \frac{40}{20}=\frac{W_{Al}}{9}$

$\Rightarrow W_{Al}=18kg$

As current efficiency is 50% so $W_{Al}=9kg$

Hence, the correct option is $\text{C}$