Question

When iron nails are dipped in a copper sulfate solution, the blue color of the solution disappears, and the solution turns green.

• A. True
• B. False

Answer 1

The correct option is A

True

Iron being more reactive than copper lies above copper in the activity series. Hence it will displace copper from copper sulfate solution to form iron sulfate. The blue color of the solution is due to $C{u}^{2+}$ ions since these get displaced by $F{e}^{2+}$ ions, hence the blue color disappears.