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Environmental Chemistry · Question 5

NEET (UG) 2020MCQEasy📈 Topic in 25% papers+4−1
1

Which of the following is not correct about carbon monoxide?

  1. It reduces oxygen carrying ability of blood.
  2. The carboxyhaemoglobin (haemoglobin bound to CO) is less stable than oxyhaemoglobin.
  3. It is produced due to incomplete combustion.
  4. It forms carboxyhaemoglobin.

Answer

(2) The carboxyhaemoglobin (haemoglobin bound to CO) is less stable than oxyhaemoglobin.

Solution

As per NCERT, CO is produced by incomplete combustion of carbon (fuels in automobiles, etc.).

CO binds to haemoglobin to form carboxyhaemoglobin, which is about 300 times more stable than the oxygen–haemoglobin complex.

⇒ The oxygen carrying capacity of blood is reduced.

∴ The statement that carboxyhaemoglobin is less stable than oxyhaemoglobin is not correct.

Answer: (2)

NEET (UG) 2020

Keep practising — Environmental Chemistry

2

Among the following, the one that is not a green house gas is :

  1. ozone
  2. sulphur dioxide
  3. nitrous oxide
  4. methane
Out of syllabusNEET (UG) 2019
3

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
Out of syllabusNEET 2018
4

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
5

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
6

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)
7

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)
8

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)
9

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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