Question

9. What happens when

(a) Dilute sulphuric acid is poured on a copper plate?

(b) Iron nails are placed in a copper sulphate solution?

Write word equations of the reactions involved.

Answer 1

Answer:

(i) No reaction occurs when dilute sulphuric acid is poured on a copper plate. However, when concentrated sulphuric acid is poured on a copper plate, hydrogen gas evolves along with the formation of blue coloured copper sulphate crystals. The chemical reaction for the reaction between concentrated sulfuric acid and copper is:

Cu + H2SO4 (conc.) -> CuSO4 + H2

ii) Iron being more reactive displaces copper from copper sulphate. In this reaction, the blue colour of copper sulphate fades and there is a deposition of copper on the iron nail.

Fe + CuSO4  →      FeSO4 + Cu

Explanation:

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Answer 2

Situation-1:-

If Dilute sulphuric acid is poured on a copper plate then the below reaction will happen.

$\boxed{\sf {Cu\atop Copper}+{H_2SO_4\atop Sulphuric\;acid}\longrightarrow {CuSO_4\atop Copper\:Sulphate}+{H_2\atop Hydrogen}}$

Situation-2:-

If Iron nails are placed in a copper sulphate solution the below reaction will happen

$\boxed{\sf {Fe\atop Iron}+{CuSO_4\atop Copper\:Sulphate}\longrightarrow {FeSO_4\atop Ferrous\:Sulphate}+{Cu\atop Copper}}$