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Question

Automobile exhaust gas that causes major respiratory problem is

A
CO
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B
CH4
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C
NO2
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D
Chlorine
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Solution

The correct option is A CO
Carbon monoxide is a toxic gas which is released from automobile exhaust, poorly maintained heating equipment, clogged chimneys, etc. Breathing CO may cause headache, vomiting, nausea. An over exposure may be lethal. Once inhaled, CO passes to bloodstream where it binds to hemoglobin instead of oxygen. This leads to oxygen deficiency in cell and the cell eventually dies off.
So, the correct option is CO.

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