In which of the following pairs of reactants, a displacement reaction will take place? a. \( \ma...

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In which of the following pairs of reactants, a displacement reaction will take place?
a. \( \mathrm{CuSO}_{4}+\mathrm{Fe} \)
b. \( \mathrm{MgSO}_{4}+\mathrm{Fe} \)
c. \( \mathrm{ZnSO}_{4}+\mathrm{Fe} \)
d. \( \mathrm{CaSO}_{4}+\mathrm{Fe} \)
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