Out of $C u, A g, F e$ and $Z n,$ the metal which can displace all others from their salt solution, is:

Z n

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C u

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A g

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F e

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Solution

The correct option is D $Z n$
The metal placed above in the electrochemical series can displace the metals placed below from their salt solution.

The order of given metals in the series is $Z n > F e > C u > A g .$

Thus, $Z n$ metal can displace all other three metals from their salt solutions.

Hence, option A is correct.

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E_{A l^{3} + / A l}^{0} + - 1.66 V, E_{C u^{2} + / C u}^{0} = + 0.34 V

E_{F e^{2} + / F e}^{0} = - 0.44 V, E_{M g^{2} + / M g}^{0} = - 1.40 V

E_{Z n^{2} + / Z n}^{0} = - 0.76 V

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