Question

The colour of the solution observed after about 1 hour of placing iron nails in copper sulphate solution is ______.

Options

• Blue

• Pale green

• Yellow

• Reddish brown

Answer 1

The colour of the solution observed after about 1 hour of placing iron nails in copper sulphate solution is pale green. 

Explanation:

When iron nails are placed in copper sulfate (CuSO₄) solution, iron displaces copper due to its higher reactivity, forming iron sulfate (FeSO₄), which gives the solution a pale green colour.