Which is/are incorrect statements ?

diamond is unaffected by conc. acids but graphite reacts with hot conc.

H N O_{3}

forming mellitic acid

C_{6} (C O O H)

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CO is toxic because it forms a complex with haemoglobin in the blood

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C_{3} O_{2}

, carbon suboxide, is a foul-smelling gas

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C O C l_{2}

is called phosphine gas

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Solution

The correct option is D $C O C l_{2}$ is called phosphine gas
It is Phoshgene. Phosphine is $P H_{3}$

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