Atmospheric carbon monoxide concentration becomes harmful at

0.5, 2

mm Hg

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0.4, 7

mm Hg

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0.3, 5

mm Hg

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0.1, 0.7

mm Hg

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Solution

The correct option is D $0.1, 0.7$ mm Hg
Carbon monoxide is deadly, colourless, odourless lethal gas produces by incomplete combustion of carbon compounds. Increased level of CO reduces the amount of oxygen carried by haemoglobin around the body in RBCs, people become more prone to heart attacks, It can cause nausea, dizziness, headache, vomiting and unconsciousness. A CO concentration of 12-13000 ppm or 0.1-0.7 mmHg is toxic.
Hence, the correct answer is '0.1-0.7 mm Hg'.

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