Question

Magnesium is more reactive than copper or iron but iron is more reactive than copper. Which of the following pots will get damaged and why ? (i) A solution of magnesium sulphate is kept into copper pot. (ii) A solution of copper sulphate is kept in iron pot (iii) A solution of magnesium sulphate is kept into iron pot

Answer 1

ii) a solution of copper sulphate kept in iron pot

since iron is more reactive than copper then it will displace copper in copper sulphate solution

             CuSO4     +  Fe  ⇒     FeSO4      +    Cu
(copper sulphate)                (iron sulphate) 

Answer 2

(i) Since Magnesium is more reactive than copper therefore no reaction take place when a solution of magnesium sulphate is put into copper pot.

(ii) When a solution of copper sulphate is put into iron pot, iron displaces copper from its solution

CuSO4 + Fe→ FeSO4 + Cu

(iii) Since Magnesium is more reactive than iron therefore no reaction take place when a solution of magnesium sulphate is put into iron pot.

Hence, iron pot will get damaged after sometime. In the other two cases no reaction takes place as the metal of the pot is less reactive than the metal in the solution.

This is a displacement reaction.

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