Chemistry
Man dies in the atmosphere of CO, because it

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

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Chemistry
The lustre of the metals is because of

Absorption of light due to the presence of cavities
High density, due to closed packing of atoms
High polish
Reflection of light due to the presence of free electrons

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