The metal that cannot be obtained by electrol | vedclass

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(B) Metals that are highly reactive,such as those in the $s$-block (e.g.,$Ca$,$Na$,$K$),have a very negative standard reduction potential. When an aqu

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$Ca$

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(B) Metals that are highly reactive,such as those in the $s$-block (e.g.,$Ca$,$Na$,$K$),have a very negative standard reduction potential. When an aqueous solution of their salts is electrolyzed,water is reduced at the cathode instead of the metal ion. The reaction at the cathode is $H_2O(l) + e^- \rightarrow \frac{1}{2} H_2(g) + OH^-(aq)$. Therefore,these metals cannot be obtained by the electrolysis of their aqueous salt solutions; they are typically extracted by the electrolysis of their molten salts.

The metal that cannot be obtained by electrolysis of an aqueous solution of its salts is $:$

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