An iron nail is kept in a blue copper sulphate solution for some time. A reddish-brown coating forms on the nail and the solution turns light green. Which statement about this change is correct?
Answer and explanation
Correct answer: This is a displacement reaction in which iron displaces copper from its salt solution.
Iron is more reactive than copper, so it displaces copper from copper sulphate solution. Light-green iron(II) sulphate forms, while reddish-brown copper is deposited on the nail: \(\mathrm{Fe + CuSO_4 \rightarrow FeSO_4 + Cu}\). In a combination reaction, reactants generally form one product; here, iron(II) sulphate and copper are two products.
Frequently asked questions
What is the correct answer to this question?
This is a displacement reaction in which iron displaces copper from its salt solution.
Why is this the correct answer?
Iron is more reactive than copper, so it displaces copper from copper sulphate solution. Light-green iron(II) sulphate forms, while reddish-brown copper is deposited on the nail: \(\mathrm{Fe + CuSO_4 \rightarrow FeSO_4 + Cu}\). In a combination reaction, reactants generally form one product; here, iron(II) sulphate and copper are two products.
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.
