Question

A large volume of copper (II) sulphate solution is left in an iron container overnight. Identify the correct statement about the reaction.

• A. The solution evaporates completely and some copper (II) sulphate crystals are left behind
• B. The part of the container in contact with the solution is coated with copper
• C. Some fine iron particles are formed in the solution
• D. Atmospheric oxygen reacts with the copper (II) sulphate to give black copper (II) oxide

Answer 1

The correct option is B The part of the container in contact with the solution is coated with copper

Iron (Fe) is more reactive than Cu. Therefore, Fe can displace Cu from its $CuS{O}_4$ solution.

Reaction:

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

So, part of the container in contact with the solution is coated with copper.

Option B is the correct answer.