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Q.
Out of $Cu ,\, Ag ,\, Fe$ and $Zn$, the metal which can displace all others from their salt solution, is
ManipalManipal 2012Electrochemistry
Solution:
The metal placed above in electrochemical series can displace the metals placed below from their salt solution.
The order of given metals in the series is $Zn ,\, Fe,\, Cu,\, Ag.$ Thus, $Zn$ metal can displace all other three metals from their salt solutions.