When an iron nail is kept in a blue copper sulphate solution for some time, the solution fades and a reddish-brown coating forms on the nail. Which type of reaction does this represent?
Answer and explanation
Correct answer: Displacement reaction
Iron is more reactive than copper, so it displaces copper from copper sulphate solution: \(\mathrm{Fe + CuSO_4 \rightarrow FeSO_4 + Cu}\). The reddish-brown coating on the nail is copper. This is a displacement reaction, whereas a combination reaction forms one product from two or more reactants.
Frequently asked questions
What is the correct answer to this question?
Displacement reaction
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 reddish-brown coating on the nail is copper. This is a displacement reaction, whereas a combination reaction forms one product from two or more reactants.
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.
