When an iron nail is placed in copper sulphate solution, the reddish-brown coating formed on the nail is of which substance?
Answer and explanation
Correct answer: Copper
Iron is more reactive than copper, so it displaces copper from copper sulphate solution: \(\mathrm{Fe + CuSO_4 \rightarrow FeSO_4 + Cu}\). The displaced copper deposits on the iron nail as a reddish-brown solid. Iron sulphate is formed in the solution; it is not the reddish-brown coating on the nail.
Frequently asked questions
What is the correct answer to this question?
Copper
Why is this the correct answer?
Iron is more reactive than copper, so it displaces copper from copper sulphate solution: \(\mathrm{Fe + CuSO_4 \rightarrow FeSO_4 + Cu}\). The displaced copper deposits on the iron nail as a reddish-brown solid. Iron sulphate is formed in the solution; it is not the reddish-brown coating on the nail.
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.
