Which of the following metal cannot be extracted from its aqueous solution by electrolysis? and why?
A) Ni B) Au C) Cu D) Al
1
Expert's answer
2015-05-25T09:10:38-0400
D) Al Aluminium has the highest negative electrode potential of mentioned metals. In aqueous solutions aluminium will cause the electrolysis of water and extraction of hydrogen gas. That is why aluminium can be extracted only from the molten aluminium.
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