When carbon monoxide is passed over solid caustic soda heated to $200^{o} C$ , it forms:

{N a}_{2} C O_{3}

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N a H C O_{3}

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H C O O N a

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C H_{3} C O O N a

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Solution

The correct option is C $H C O O N a$
Carbon monoxide react with sodium hydroxide to produce sodium formate( $H C O O N a$ ). This reaction takes place an overpressure, temperature 120-200°C and the presence of catalyst.
$C O + N a O H \to H C O O N a$
Hence, option $C$ is correct.

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