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Environmental Chemistry · Question 7

NEET 2018MCQEasy📈 Topic in 25% papers+4−1
1

Which oxide of nitrogen is not a common pollutant introduced into the atmosphere both due to natural and human activity?

  1. N2O5
  2. NO2
  3. N2O
  4. NO

Answer

(1) N2O5

Solution

As per NCERT, N2 and O2 combine at high temperature (lightning, automobile engines, burning of fossil fuels) to give NO, which is oxidised to NO2:

N2 + O2 1483 K 2NO

2NO + O2 2NO2

N2O is released naturally (soil bacteria) and from fertilisers and combustion.

N2O5 is not released in this way and is not a common atmospheric pollutant.

Answer: (1)

Out of syllabusNEET 2018

Keep practising — Environmental Chemistry

2

Which of the following is a sink for CO?

  1. Microorganisms present in the soil
  2. Oceans
  3. Plants
  4. Haemoglobin
Out of syllabusNEET 2017
3

Which one of the following is not a common component of Photochemical smog?

  1. Ozone
  2. Acrolein
  3. Peroxyacetyl nitrate
  4. Chlorofluorocarbons
Out of syllabusAIPMT 2014
4

Which one of the following statements is not true?

  1. Clean water would have a BOD value of 5 ppm.
  2. Fluoride deficiency in drinking water is harmful. Soluble fluoride is often used to bring its concentration up to 1 ppm.
  3. When the pH of rain water is higher than 6.5, it is called acid rain.
  4. Dissolved Oxygen (DO) in cold water can reach a concentration up to 10 ppm.
Out of syllabusNEET 2013 (Karnataka)
5

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.
Out of syllabusAIPMT 2012 (Prelims)
6

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)
7

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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