Chemistry
Cement containing excess amount of lime

Cracks during setting
Is slow setting
Becomes more strong
Is quick setting

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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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