Which of the following can undergo a chemical reaction ?

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${ZnSO}_{4} + Fe$

${MgSO}_{4} + Fe$

${CuSO}_{4} + Fe$

${MgSO}_{4} + Pb$

answer is C.

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Detailed Solution

Checking the reactivity of elements from the reduction potential is necessary to anticipate the viability of a reaction. Elements with a lower negative value in an electrochemical series cannot diminish an element with a higher negative value. The other element must be more reactive in order to remove one from its solution. It implies that in the electrochemical series, it should come before that element.

The order of elements in terms of reactivity is Mg>Zn>Fe>Pb>Cu. So a metal lying above can reduce a metal lying below from it's salt. In the given options Fe only reduce Cu from it's salt. Thus chemical change takes place in the reaction; ${CuSO}_{4} + Fe \to {FeSO}_{4} + Cu$

Hence, option C is correct.

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