A chemical reaction takes place when iron dust is added into copper sulphate solution but no reaction takes place when copper dust is added into ferrous sulphate solution, why?

The reaction between copper and ferrous sulfate will not occur the reason is that copper is less reactive than iron. The reaction can be written as

Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s)

In the reactivity series iron is above it will replace the copper in the copper sulfate compound, so this reaction will occur.

The reverse reaction can be written as

Cu(s) + FeSO4(aq) → CuSO4(aq) + Fe(s)

Copper is less reactive than iron as the iron carries major position in the reactivity series. so it will not replace the iron in the compound. No reaction will take place here and the equation should be written as:

Cu(s) + FeSO4(aq) → no reaction

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