Chemistry
Silver nitrate solution is kept in brown bottles in laboratory because

It reacts with ordinary white bottles
Brown bottles react with it
Brown bottles do not react with it
Brown bottles stops the passage of light through it

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Chemistry
Man dies in the atmosphere of CO, because it

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

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