Why does a reddish-brown coating form on an iron nail placed in copper sulphate solution?
Answer and explanation
Correct answer: Iron displaces copper from copper sulphate, and copper deposits on the nail.
Iron is more reactive than copper, so it displaces copper from copper sulphate solution. The displaced copper deposits on the iron nail as a reddish-brown coating. The reaction is \(\mathrm{Fe + CuSO_4 \rightarrow FeSO_4 + Cu}\). Iron oxide in option C is associated with rusting, whereas the coating in this reaction is copper.
Frequently asked questions
What is the correct answer to this question?
Iron displaces copper from copper sulphate, and copper deposits on the nail.
Why is this the correct answer?
Iron is more reactive than copper, so it displaces copper from copper sulphate solution. The displaced copper deposits on the iron nail as a reddish-brown coating. The reaction is \(\mathrm{Fe + CuSO_4 \rightarrow FeSO_4 + Cu}\). Iron oxide in option C is associated with rusting, whereas the coating in this reaction is copper.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
