Chemistry
Smoke is formed due to

Gas dispresed in solid
Solid dispersed in gas
Gas dispersed in gas
Solid dispresed in liquid

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Chemistry
Photo chemical smog is a resultant of the reaction among

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

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Chemistry
Atoms of different elements have

Different atomic number and same eletronic configu-ration
Same atomic number and same electronic configuration
Same number of electrons and neutrons
Different atomic number and different number of valence electrons

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