Question

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Answer 1

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(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:

$\bf\green{Cu + H_2SO_4 (conc.) → CuSO_4 + H_2}$

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.

$\bf\green{Fe + CuSO_4 → FeSO_4 + Cu}$

Answer 2

Answer:

1. (a) When dilute sulphuric acid is poured on a copper plate, no reaction takes place due to less reactivity of copper. ... Copper gets deposited on the iron nail and green solution is ferrous sulphate solution
2. Chemical reaction of iron nail with copper sulphate solution in water. Iron displaces copper ions from an aqueous solution of copper sulphate. ... In this reaction, metallic iron is converted into ferrous ion (Fe2+) and cupric ion (Cu2 +) is converted into metallic copper. Fe (s) + Cu2 + (aq) —→ Fe2+ (aq) + Cu (s)

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