Environmental Chemistry · JEE Main previous year questions

2022 7 questions

1. Q782022 · 28 Jul 2022 · Shift 1

   Given below are two statements: Statement I : In polluted water values of both dissolved oxygen and BOD are very low. Statement II : Eutrophication results in decrease in the amount of dissolved oxygen. In the light of the above statements, choose the most appropriate answer from the options given below :

   1. A.Both Statement I and Statement II are true
   2. B.Both Statement I and Statement II are false
   3. C.Statement I is true but Statement II is false
   4. D.Statement I is false but Statement II is true
   Show answer

   Answer: D

2. Q782022 · 27 Jul 2022 · Shift 1

   Match List I with List II. | List I Pollutant | | List II Disease/sickness | | :--- | :--- | :--- | | (A) Sulphate (>500 ppm) | (I) | Methemoglobinemia | | (B) Nitrate (>50 ppm) | (II) | Brown mottling of teeth | | (C) Lead (>50 ppb) | (III) | Laxative effect | | (D) Fluoride (>2 ppm) | (IV) | Kidney damage | Choose the correct answer from the options given below :

   1. A.A-IV, B-I, C-II, D-III
   2. B.A-III, B-I, C-IV, D-II
   3. C.A-II, B-IV, C-I, D-III
   4. D.A-II, B-IV, C-III, D-I
   Show answer

   Answer: B

3. Q782022 · 28 Jun 2022 · Shift 2

   Correct statement about photo-chemical smog is :

   1. A.It occurs in humid climate.
   2. B.It is a mixture of smoke, fog and $\mathrm{S}{\mathrm{O}}_2$.
   3. C.It is reducing smog.
   4. D.It results from reaction of unsaturated hydrocarbons.
   Show answer

   Answer: D

4. Q792022 · 26 Jun 2022 · Shift 2

   The measured BOD values for four different water samples (A-D) are as follows: A = 3 ppm; B = 18 ppm; C = 21 ppm; D = 4 ppm. The water samples which can be called as highly polluted with organic wastes, are :

   1. A.A and B
   2. B.A and D
   3. C.B and C
   4. D.B and D
   Show answer

   Answer: C

5. Q782022 · 25 Jun 2022 · Shift 1

   The eutrophication of water body results in :

   1. A.loss of Biodiversity.
   2. B.breakdown of organic matter.
   3. C.increase in biodiversity.
   4. D.decrease in BOD.
   Show answer

   Answer: A

6. Q792022 · 25 Jun 2022 · Shift 2

   Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Polluted water may have a value of BOD of the order of 17 ppm. Reason R : BOD is a measure of oxygen required to oxidise both the bio-degradable and non- biodegradable organic material in water. In the light of the above statements, choose the most appropriate answer from the options given below.

   1. A.Both A and R are correct and R is the correct explanation of A.
   2. B.Both A and R are correct but R is NOT the correct explanation of A.
   3. C.A is correct but R is not correct.
   4. D.A is not correct but R is correct.
   Show answer

   Answer: C

7. Q782022 · 24 Jun 2022 · Shift 2

   Some gases are responsible for heating of atmosphere (green house effect). Identify from the following the gaseous species which does not cause it.

   1. A.${\mathrm{CH}}_4$
   2. B.${\mathrm{O}}_3$
   3. C.${\mathrm{H}}_2\mathrm{O}$
   4. D.${\mathrm{N}}_2$
   Show answer

   Answer: D