Question

Copper can be displaced from aqueous solution of copper sulphate by adding:

• A. $Ag$
• B. $Au$
• C. $Zn$
• D. $Fe$

Answer 1

Answer: (C), (D)

The correct options are
C $Zn$
D $Fe$

When zinc reacts with a solution of copper sulphate, we obtain Zinc Sulphate and Copper.

$Zn$ + $CuS{O}_4$ $\to$ $ZnS{O}_4$ + $Cu$

Zinc lies above Copper in the activity series. The activity series of metals refers to the list of metals ranked in the decreasing order of their reactivity to displace Hydrogen gas from water or acid solutions

Iron metal is more reactive than copper. Therefore, it can displace copper from the copper sulphate solution. Cu is less reactive than iron, therefore, cannot replace iron from iron sulphate.

$Fe$ + $CuS{O}_4$ $\to$ $FeS{O}_4$ + $Cu$