Chemistry
Setting of plaster of paris involves

Oxidation process
Dehydration process
Reduction process
Hydration to form other hydrates

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Chemistry
Photo chemical smog is a resultant of the reaction among

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
High concentration of NO2, O3, and CO in the evening

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