Chemistry
The advantage of detergents over soaps is

Detergents are soluble in water
Detergents give lather even with hard water
Soaps give lather with only soft water
Detergents could not give much lather

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Chemistry
Man dies in the atmosphere of CO, because it

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

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