Iron nails become ______ after being dipped in copper sulphate solution.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. brownish.
- When an iron nail is dipped in copper sulphate solution, it forms a brown coating and the colour of the solution changes from blue to light green.
- This reaction demonstrates that iron is more reactive than copper, as it displaces copper from its solution and passes into solution as Fe(II) ions, forming ferrous sulphate solution.