A clean iron nail is immersed in a blue copper sulphate solution for some time. Which observation is correct?
Answer and explanation
Correct answer: The blue solution will turn pale green and reddish-brown copper will deposit on the nail.
Iron is more reactive than copper, so it displaces copper from copper sulphate: \\(\mathrm{Fe + CuSO_4 \rightarrow FeSO_4 + Cu}\\). The iron sulphate formed makes the solution pale green, and displaced copper appears as a reddish-brown deposit on the nail. Unlike option B, the solution does not become colourless after the reaction.
Frequently asked questions
What is the correct answer to this question?
The blue solution will turn pale green and reddish-brown copper will deposit on the nail.
Why is this the correct answer?
Iron is more reactive than copper, so it displaces copper from copper sulphate: \\(\mathrm{Fe + CuSO_4 \rightarrow FeSO_4 + Cu}\\). The iron sulphate formed makes the solution pale green, and displaced copper appears as a reddish-brown deposit on the nail. Unlike option B, the solution does not become colourless after the reaction.
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.
