Chemistry
Bhopal gas tragedy is associated with leakage of

Carbon dioxide
Sulphur dioxide
Methyl isocyanate
Nitrogen dioxide

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

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