The non-metal which is not affected by caustic soda (NaOH) is:

Carbon

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Silicon

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Phosphorus

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Sulphur

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Solution

The correct option is A Carbon
When carbon dioxide reacts with sodium hydroxide then oxidation state of carbon do not get affected; so no change in carbon.
$+ 4 C O_{2} + N a O H ⟶ + 4 N a H C O_{3}$

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