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Environmental Chemistry · Question 11

AIPMT 2012 (Prelims)MCQEasy📈 Topic in 25% papers+4−1
1

Which one of the following statements regarding photochemical smog is not correct?

  1. Carbon monoxide does not play any role in photochemical smog formation.
  2. Photochemical smog is an oxidising agent in character.
  3. Photochemical smog is formed through photochemical reaction involving solar energy.
  4. Photochemical smog does not cause irritation in eyes and throat.

Answer

(4) Photochemical smog does not cause irritation in eyes and throat.

Solution

As per NCERT, photochemical smog is formed by the action of sunlight on nitrogen oxides and hydrocarbons; it contains oxidising agents such as O3, NO, PAN, acrolein and formaldehyde, so it is oxidising in nature.

Ozone and PAN act as powerful eye irritants, and ozone and nitric oxide irritate the nose and throat.

Statement (4) is not correct.

Answer: (4)

Out of syllabusAIPMT 2012 (Prelims)

Keep practising — Environmental Chemistry

2

Which one of the following statements is not true?

  1. pH of drinking water should be between 5.5–9.5.
  2. Concentration of DO below 6 ppm is good for the growth of fish.
  3. Clean water would have a BOD value of less than 5 ppm.
  4. Oxides of sulphur, nitrogen and carbon are the most widespread air pollutants.
Out of syllabusAIPMT 2011 (Prelims)
3

Green chemistry means such reactions which

  1. are related to the depletion of ozone layer
  2. study the reactions in plants
  3. produce colour during reactions
  4. reduce the use and production of hazardous chemicals
Out of syllabusAIPMT 2008

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