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Gravity Separation

The metals wh...

Question

The metal(s) which cannot be obtained by electrolysis of aqueous solution of their salts is/are :

A

Ag

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B

Mg

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C

Cu

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D

Al

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Solution

The correct options are
A Al
D Cu
(a) During roasting S, As and Sb will be oxidized into their volatile oxides $S O_{2}, A s_{2} O_{3}$ and $S b_{2} O_{3}$ respectively.
(c) During roasting, $F e O$ is oxidized into $F e_{2} O_{3}$ which does not form slag with silica.
(d) $F e_{2} O_{3} .3 H_{2} O Δ - \to F e_{2} O_{3} + 3 H_{2} O ↑$

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