Which new salt is formed when an iron nail is placed in copper sulphate solution?
Answer and explanation
Correct answer: Iron sulphate
Iron is more reactive than copper, so it displaces copper from copper sulphate solution. The balanced reaction is Fe + CuSO₄ → FeSO₄ + Cu. The sulphate ion remains associated with iron, producing iron sulphate, while copper is deposited as a reddish-brown solid. Copper sulphate is the reactant, and sodium or barium sulphate is not formed. Therefore, option A is correct.
Frequently asked questions
What is the correct answer to this question?
Iron sulphate
Why is this the correct answer?
Iron is more reactive than copper, so it displaces copper from copper sulphate solution. The balanced reaction is Fe + CuSO₄ → FeSO₄ + Cu. The sulphate ion remains associated with iron, producing iron sulphate, while copper is deposited as a reddish-brown solid. Copper sulphate is the reactant, and sodium or barium sulphate is not formed. Therefore, option A is correct.
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.
