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NEET Previous Year Questions : Environmental Chemistry

1. Which of the following is not correct about carbon monoxide? (NEET 2020)

(a) It forms carboxyhemoglobin.

(b) It reduces oxygen carrying ability of blood.

(c) The carboxyhemoglobin (hemoglobin bound to CO) is less stable than oxyhemoglobin.

(d) It is produced due to incomplete combustion.

2. Among the following, the one that is not a greenhouse gas is (NEET 2020)

(a) Sulphur dioxide                   (b) nitrous oxide

(c) Methane                                (d) ozone.

3. Which oxide of nitrogen is not a common pollutant? Introduced into the atmosphere both due to Natural and human activity?                   (NEET 2018)

(a) N2O5                       (b) NO2

(c) N2O                         (d) NO

Chemistry Notes

Physics Notes

Biology Notes

4. Which of the following is a sink for CO?                                (NEET 2017)

(a) Microorganisms present in the soil

(b) Oceans

(c) Plants

(d) Hemoglobin

5. Which one of the following is not a common component of photochemical smog?                                                                                      (2014)

(a) Ozone

(b) Acrolein

(c) Peroxyacetyl nitrate

(d) Chlorofluorocarbons

6. Which one of the following statements regarding Photochemical smog is not correct?                                                                                  (2012)

(a) Carbon monoxide does not play any role in photochemical smog formation.

(b) Photochemical smog is an oxidizing agent in character.

(c) Photochemical smog is formed through photochemical reaction involving solar energy.

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

7. Which one of the following is responsible for depletion of the ozone layer in the upper Strata of the atmosphere?                                          (2004)

(a) Polyhalogens               (b) Ferrocene

(c) Fullerenes                      (d) Freon’s

9. Which one of the following statements is not true?     (NEET2013)

(a) Clean water would have a BOD value of 5 ppm.

(b) Fluoride deficiency in drinking water is harmful. Soluble fluoride is often used to bring its concentration up to 1 ppm.

(c) When the pH of rain water is higher than 6.5, it is called acid rain.

(d) Dissolved Oxygen (DO) in cold water can reach a concentration up to 10 ppm.

10. Which one of the following statements is not true?                (2011)

(a) pH of the drinking water should be between 5.5−9.5 .

(b) Concentration of the DO below 6 ppm is good for the growth of fishes

(c) Clean water should have a BOD value of less than 5 ppm.

(d) Oxides of sulphur, nitrogen, and carbon are the most widespread air pollutants.

11. Green chemistry means such reactions which              (2008)

(a) Are related to the depletion of ozone layer

(b) Study the reactions in plants

(c) Produce color during reactions

(d) Reduce the use and production of hazardous chemicals. 



(a) (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)

(b) (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)

(c) (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)

(d) (a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)

Answer Key


1. (c) 2. (a) 3. (a) 4. (a) 5. (d) 6. (d) 7. (d) 9. (c) 10. (b) 11. (d) 12. (c)

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