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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 SO2, As2O3 and Sb2O3 respectively.
(c) During roasting, FeO is oxidized into Fe2O3 which does not form slag with silica.
(d) Fe2O3.3H2OΔFe2O3+3H2O

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