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(D) Metals that are highly reactive,such as those at the top of the electrochemical series (e.g.,$Al$,$Mg$,$Na$,$Ca$),cannot be obtained by the electr

Vedclass · Accepted Answer

$Al$

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(D) Metals that are highly reactive,such as those at the top of the electrochemical series (e.g.,$Al$,$Mg$,$Na$,$Ca$),cannot be obtained by the electrolysis of their aqueous salt solutions. During the electrolysis of an aqueous solution of an $Al$ salt,$H_2O$ is reduced at the cathode instead of $Al^{3+}$ ions because the reduction potential of $H_2O$ is higher than that of $Al^{3+}$. Therefore,$Al$ is extracted by the electrolytic reduction of its molten oxide $(Al_2O_3)$ dissolved in molten cryolite $(Na_3AlF_6)$.

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

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