Question

What happens when

(a) Dilute sulphuric acid is poured on a copper plate?
(b) Iron nails are placed in copper sulphate? Write word equations of the reactions involved.

Answer 1

Answer:

(a) When dilute sulphuric acid is poured on a copper plate, no reaction takes place due to less reactivity of copper.

(b) When iron nails are placed in a copper sulphate solution, the blue colour of the sopper sulphate solution changes to green, due to the displacement of copper in copper sulphate by iron.

Answer 2

Answer:

• Copper does not react with dilute sulphuric acid. So, no reaction takes place when dilute sulphuric acid is poured on a copper plate. But when concentrated sulphuric acid is poured over copper plate, effervescence is observed.
• Iron is more reactive than copper. When iron nails are placed in a copper sulfate solution, iron displaces copper to form iron sulfate. Slowly, the blue color of the copper sulfate solution turns into green.