Chemistry
Which of the following is not a gaseous air pollutant?

Hydrocarbon
Oxides of sulphur
Smoke
Oxides of nitrogen

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Chemistry
Photo chemical smog is a resultant of the reaction among

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

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Chemistry
Water cycle refers to

Constant movement of water from ocean to land and back to ocean once again
An integrated attempt to recycle water in relatively arid regions
Scientific management of water in areas excessively plagued with water-logging
Water distribution in relatively dry areas

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