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Q.

Which of the following metals are obtained by the electrolysis of their molten chlorides?

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a

All the above 

b

Calcium

c

Magnesium  

d

Sodium

answer is D.

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Detailed Solution

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Sodium, Magnesium, and Calcium are highly reactive metals. They are not easily reduced by carbon and aluminum. Thus, they are extracted by electrolytic reduction or electrolysis of their molten chlorides (sodium chloride (NaCl), and magnesium chloride, MgCl2). Whereas Gold is extracted by hydrometallurgical process, based on its property of being electropositive.

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