Question

2.8 g of iron displaces 3.2 g of copper from a solution of copper sulphate. If the equivalent mass of iron is 28, then equivalent mass of copper will be :

• A. 16
• B. 32
• C. 48
• D. 64

Answer 1

The correct option is B 32

As $2.8g$ of iron displaces $3.2g$ of Cu from a solution of copper sulphate. Then the equivalent mass of copper can be determined as follows:

W = mass, E = equivalent mass.

$\frac{W_{Cu}}{E_{Cu}}=\frac{W_{Fe}}{E_{Fe}}=\frac{3.2}{E_{Cu}}=\frac{2.8}{28}$

$\frac{3.2}{E_{Cu}}=\frac{2.8}{28}=0.1$

So, $\frac{3.2}{E_{Cu}}=0.1$

$E_{Cu}=\frac{3.2}{0.1}=32$

So, equivalent weight of $Cu$ is $32$. Option B.