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प्रश्न
Which of the following pair of reactants can undergo a displacement reaction under appropriate conditions?
विकल्प
MgSO4 + Fe
ZnSO4 + Fe
MgSO4 + Pb
CuSO4 + Fe
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उत्तर
CuSO4 + Fe
Explanation:
A displacement reaction can only occur if a more reactive free metal reacts with the salt solution of a less reactive metal. According to the metal reactivity series, the order of reactivity is Mg > Zn > Fe > Cu. Because iron (Fe) is more reactive than copper (Cu), it successfully displaces copper to form iron sulphate and solid copper:
\[\ce{Fe + CuSO4 -> FeSO4 + Cu}\]
In all the other options, the free metal (Fe) or (Pb) is less reactive than the metal in the compound (Mg) or (Zn), resulting in no reaction
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