Chemistry
The compound used in pricklyheat powder to prevent excessive sweating is

Carbonic acid
Boric acid
Phosphoric acid
Sulphuric acid

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Chemistry
Man dies in the atmosphere of CO, because it

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

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