Chemistry
Glycol is added to aviation gasoline because it

Reduces consumption of petrol
Reduces evaporation of petrol
Increases efficiency of petrol
Prevents freezing of petrol

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Chemistry
Man dies in the atmosphere of CO, because it

Combines with the haemoglobin of blood, thereby making the later incapable of absorbing O2
Combines with O2 present in the body
Reduces the organic matter of tissues
Dries up the blood

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