Question

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Answer 1

Highly reactive metals with lower reduction potentials than hydrogen are not obtained by electrolysis of aqueous solutions of their salts since their cations cannot be reduced at cathode in presence of water. Instead of reduction of these metal cations, water undergoes reduction.

Here Mg is highly reactive.so answer is Mg.

Answer 2

Question :

Which one of the following metals cannot be obtained on electrolysis of aqueous solution of its salts .

a) Ag                                         b) Mg

c) Cu                                         d) Cr

Answer :

OPTION (b) Mg

Explanation :

↪ The electrochemical series or the activity series has to be remembered :'(

↪ The electrochemical series is a series of metals which are arranged on the basis of their reactivity .

↪ The metals with the highest reactivity is placed at the top .

↪ The metals with the lowest reactivity is placed at the bottom .

↪ The electrolysis depends on the electrochemical series .

↪ The metals at the top are not liberated at the cathodes easily .

↪ Hence the metals at the bottom can be easily obtained from their salts .

Electrochemical series metals :

K

Na

Ca

Mg

Al

Zn

Fe

Pb

H

Cu

Hg

Ag

The metals above hydrogen cannot be prepared by electrolysis .

Since among the options only magnesium is above hydrogen , so answer will be Magnesium .