The yellow colour in photochemical smog is due to presence of__________________?
Correct answer: B. nitrogen dioxide
- A. dinitrogen oxide
- B. nitrogen dioxide
- C. chlorine gas
- D. chlorine dioxide
Explanation
Nitrogen dioxide absorbs visible light and gives photochemical smog its characteristic yellow-brown colour. Dinitrogen oxide, N2O, is not the same substance and is the likely confusion behind choosing a.
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About Real and Ideal Gases
An ideal gas is modelled as particles with negligible volume and no intermolecular attraction, obeying Boyle's, Charles's and Avogadro's laws through PV = nRT. Real gases deviate from this behaviour, especially at high pressure and low temperature, because particle volume and attractive forces matter; the van der Waals equation explains these corrections.
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