A colourless, non-irritant, highly toxic gas that impairs respiration is?

S O_{2}

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N O_{2}

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C O_{2}

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Solution

The correct option is D CO
Carbon monoxide has a greater affinity than Oxygen towards Haemoglobin.
It binds to Haemoglobin and causes respiratory impairment.
It is colourless and non-irritant and highly toxic gas.
So, the correct option is 'CO'.

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