Chemistry
Cyanide poisoning causes death in seconds because

It breaks the electron transport chain
It causes Lysis of red blood cells
It causes cardiac arrest
It denatures enzymes of the heart/muscle

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Chemistry
Photo chemical smog is a resultant of the reaction among

CO, O2 and peroxy acetyl nitrate in the presence of Sunlight
NO2, O3 and peroxy acetyl nitrate in the presence of Sunlight
High concentration of NO2, O3, and CO in the evening
CO, CO2 and NO2at low temperature

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