Chemistry
It is dangerous to leave the car engine running in a closed garage, because it may cause serious pollution due to poisoning by emission of

CO
SO2
Unburnt petrol
CO2

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Chemistry
Which of the process is known as nitrification?

Reaction of nitrogen dioxide with water to form nitric acid
Reaction of Nitrogen Monoxide with oxygen to form nitric acid
Conversion of nitrite to nitric oxide
Conversion of ammonia to nitrites

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Chemistry
Photo chemical smog is a resultant of the reaction among

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

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