Chemistry
The absolute temperature of a gas is doubled and the pressure is reduced to half, the volume of the gas

Will be reduced to half
Will increase four-fold
Will be doubled
Remains unchanged

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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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