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  4. By electrolytic reduction method, the total number of metals that can be best extracted from their aqueous solutions among following will be: Fe,Cu,Ag,Na,K,Zn,Mg,Mn,Cr,CaandAl.

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Q. By electrolytic reduction method, the total number of metals that can be best extracted from their aqueous solutions among following will be:
$Fe,Cu,Ag,Na,K,Zn,Mg,Mn,Cr,CaandAl.$

NTA AbhyasNTA Abhyas 2022

Solution:

A metal can only be extracted from its aqueous solution if its standard reduction potential is positive. In case of highly electropositive metal the reduction of water will occur.
From the given metals only these can be extracted,
$Cu,Ag$