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Metals like sodium, potassium, calcium and magnesium are extracted by electrolysis of their chloride in a molten state. These metals are not extracted by reducing of their oxides with carbon because
A)    Reduction with carbon is very expensive
B)    Carbon readily makes alloy with these metals
C)    Carbon has less affinity for oxygen than these metals
D) Carbon is weaker reducing agent than these metals

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An Intiative by Sri Chaitanya

c and d

b and c

d and a

a and b

answer is C.

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Detailed Solution

It is because these metals are highly electropositive and cannot be reduced by chemical methods. Hence we use electrolytic reduction of their molten salts for their extraction

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