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(B) The metals $Mg$ (Magnesium) belongs to the $s$-block elements (alkaline earth metals). Due to their highly negative standard reduction potentials,

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$Mg$

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(B) The metals $Mg$ (Magnesium) belongs to the $s$-block elements (alkaline earth metals). Due to their highly negative standard reduction potentials,the reduction of water occurs more readily than the reduction of $Mg^{2+}$ ions at the cathode during the electrolysis of an aqueous solution. Consequently,$H_2$ gas is evolved at the cathode instead of the deposition of $Mg$ metal. In contrast,$Cu$,$Cr$,and $Ni$ have higher reduction potentials and can be deposited at the cathode from their aqueous solutions.

Which metal cannot be obtained from the electrolysis of its aqueous salt solution?

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