Question

Beakers A, B, and C contain zinc sulphate, silver nitrate, and ferrous sulphate solutions respectively. Copper pieces are added to each beaker. Blue colour will appear in case of:

• A. Beaker A
• B. Beaker B
• C. Beaker C
• D. All the beakers

Answer 1

The correct option is B

Beaker B

As per the reactivity series, copper is more reactive than silver but less reactive than iron and zinc. So, a blue coloured solution of copper nitrate will form in beaker B as copper will be displaing silver from silver nitrate solution.
Reaction involved is :
$\text{Cu}\text{(s)}+2{\text{AgNO}}_3\text{(aq)}\to 2\text{Ag}\text{(s)}+{\text{Cu(NO}}_3{)}_2\text{(aq)}$