Which of the following is a silent killer gas, which combines with haemoglobin in the blood?

C O_{2}

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C O

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N O

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N O_{2}

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Solution

The correct option is A $C O$
Carbon monoxide $(C O)$ poisoning occurs when carbon monoxide gas is inhaled. When the gas is inhaled and comes in contact with the blood, it combines more readily with haemoglobin than oxygen does.

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