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why K nd Na c...

Question

why K nd Na can not be extracted by reduction of their oxides by carbon

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Solution

Some of the alkali or alkaline earth metals like Na, K , Ca, Mg, Al etc. are found high up in the reactivity series and so they are highly reactive and behave as strong reducing agents. Further, these metals have strong affinity towards oxygen than the carbon, so they can not be extracted from their oxides by carbon.

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Q. Which of the following metals can not be extracted by carbon reduction process?

Q. Metals like sodium, potassium, calcium and magnesium are extracted by electrolysis of their chlorides in molten state. These metals are not extracted by reduction of their oxides with carbon because:
a) Reduction with carbon is very expensive
b) Carbon readily makes alloys with these metals
c) Carbon has less affinity for oxygen than these metals
d) Carbon is a weaker reducing agent than these metals

Q. Metals which can be obtained by carbon reduction of their oxides are _________.

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