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Given below are the following reactions of different metals with their salt solutions:
(i) $Cu + 2 {AgNO}_{3} \to 2 Ag + Cu {({NO}_{3})}_{2}$
(ii) $Zn + {FeSO}_{4} \to Fe + {ZnSO}_{4}$
(iii) $Fe + {CuSO}_{4} \to {FeSO}_{4} + Cu$
Arrange the metals, Cu, Fe, Ag and Zn in increasing order of their reactivity

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Ag < Cu < Fe < Zn

Ag < Zn < Fe < Cu

Zn < Fe < Ag < Cu

Cu < Ag < Fe < Zn

answer is A.

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Detailed Solution

The increasing order of their reactivity is $Ag < Cu < Fe < Zn$ .

A more reactive metal can displace all others from a salt solution.

Of the options given, zinc has the lowest reduction potential, so it can displace all other metals from the salt solution.

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