Beakers A, B, and C contain zinc sulphate, silver sulphate, and ferrous sulphate solutions respectively. Copper filings are added to each beaker. Blue colour will appear in which of the following beakers?

The correct option is B Beaker B
Copper is less reactive than zinc and iron, but is more reactive than silver and hence, displaces silver from its salt solution.

Copper on reaction with silver sulphate forms copper sulphate and silver in which copper sulphate is blue in colour. This can be represented as:
$\text{Silver sulphate}+\text{Copper}\to \text{Silver}+\text{Copper sulphate}$