Explain the following with reason : (i) On the iron nails dipped … - Vidyadip

Question

Explain the following with reason :
(i) On the iron nails dipped in $CuSO _4$ solution, Cu get deposited.
(ii) Na reacts with water at normal temperature while Mg react with hot water.

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Answer

(i) Fe is more reactive than Cu . As more reactive metal, displaces less reactive metal from its salt solution. Hence, following reaction takes place :
$Fe(s)+CuSO_4(aq) \longrightarrow FeSO_4(aq)+Cu(s)$
The released copper get deposited on iron nails.
(ii) Na is more reactive than Mg . Hence, Na react with water at normal temperature while Mg react with water at hot temperature.

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