When HCOOH acid is heated with conc. $H_{2} S O_{4}$ , the gas evolved is:

Only

C O_{2}

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C O + C O_{2}

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S O_{2} + C O_{2}

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C O

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Solution

The correct option is D $C O$
$H C O O H + H_{2} S O_{4} \to C O + H_{2} S O_{4} . H_{2} O$
Carbon monoxide gas evolved when formic acid heated with sulpheric acid $.$
Carbon monoxide is toxic gas when cause respiratory defects and exploration of those diseases cause even death also $.$
Hence $,$ option $(D)$ is correct $.$

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