What coloured coating forms on an iron nail when it is placed in copper sulphate solution?
Answer and explanation
Correct answer: Reddish-brown
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. Blue is the colour of the copper sulphate solution, not of the coating on the nail. Reaction: \(\mathrm{Fe + CuSO_4 \rightarrow FeSO_4 + Cu}\).
Frequently asked questions
What is the correct answer to this question?
Reddish-brown
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. Blue is the colour of the copper sulphate solution, not of the coating on the nail. Reaction: \(\mathrm{Fe + CuSO_4 \rightarrow FeSO_4 + Cu}\).
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.
