Carbon cannot reduce the oxides of sodium to sodium because

N a

has less affinity for oxygen

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N a

has more affinity for carbon than oxygen

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N a

is non-reactive

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N a

has more affinity for oxygen than carbon

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Solution

The correct option is D $N a$ has more affinity for oxygen than carbon
The metals high up in the activity series are very reactive. They cannot obtain by reduction of their oxides by carbon. Since, sodium is high up in the acitivity series, carbon cannot reduce the oxides of sodium because it has more affinity for oxygen than carbon.

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