The metals sodium, calcium, and magnesium at the top of the reactivity series can be obtained by:

reduction of their oxides

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oxidation

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electrolysis of their molten chlorides

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heating

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Solution

The correct option is C electrolysis of their molten chlorides
The metals high up in the activity series are very reactive. They cannot be obtained by heating their compounds with carbon. Reduction of their oxides by carbon is not possible because these metals have a high affinity for oxygen than carbon.
Sodium, calcium, and magnesium metals are obtained by the electrolysis of their molten chlorides, e.g., extraction of $N a$ from $N a C l$ .
Option $C$ is correct.

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Similar questions

Aluminium is obtained by the electrolysis of molten aluminium oxide. A metal just below aluminium in the reactivity series can be extracted by which method easily:

Q. Arrange the metals: calcium, iron, magnesium and sodium in order of their activity with water placing the most reactive first.

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:
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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

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