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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}



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