CBSE Class 10 Science 2019 · Paper 31/1/3/C · Question 11
A solution of copper sulphate was kept in an iron pot. After few days the iron pot was found to have a number of holes in it. Explain the reason in terms of reactivity. Also write the chemical equation of the reaction involved.
Answer
Iron is more reactive than copper, so it displaces copper from copper sulphate solution and holes form in the pot.
Iron is more reactive than copper: it lies above copper in the reactivity series. So the iron of the pot displaces copper from the copper sulphate solution. Iron from the wall of the pot goes into the solution as iron(II) sulphate and copper is deposited; as this goes on for days, the iron of the pot is used up wherever the solution touches it, and holes form. (The blue solution turns pale green and a reddish-brown deposit of copper appears.)
Equation:
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