Environmental Chemistry · JEE Main previous year questions

Match List I with List II | LIST I | | LIST II | | :--- | :--- | :--- | | A. Nitrogen oxides in air | I. | Eutrophication | | B. Methane in air | II. | pH of rain water becomes 5.6 | | C. Carbon dioxide | III. | Global warming | | D. Phosphate fertilisers in water | IV. | Acid rain | Choose the correct answer from the options given below :

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

The number of incorrect statement/s about the black body from the following is __________ (A) Emit or absorb energy in the form of electromagnetic radiation. (B) Frequency distribution of the emitted radiation depends on temperature. (C) At a given temperature, intensity vs frequency curve passes through a maximum value. (D) The maximum of the intensity vs frequency curve is at a higher frequency at higher temperature compared to that at lower temperature.

The statement/s which are true about antagonists from the following is/are: A. They bind to the receptor site. B. Get transferred inside the cell for their action. C. Inhibit the natural communication of the body. D. Mimic the natural messenger. Choose the correct answer from the options given below:

1. A.B only
2. B.A and B
3. C.A and C
4. D.A, C and D

How can photochemical smog be controlled?

1. A.By using catalytic convertors in the automobiles/industry.
2. B.By complete combustion of fuel.
3. C.By using tall chimneys.
4. D.By using catalyst.

Formation of photochemical smog involves the following reaction in which $\mathrm{A}$, $\mathrm{B}$ and $\mathrm{C}$ are respectively. i. ${\mathrm{NO}}_2\stackrel{h\nu }{\to }\mathrm{A}+\mathrm{B}$ ii. $\mathrm{B}+{\mathrm{O}}_2\to \mathrm{C}$ iii. $\mathrm{A}+\mathrm{C}\to {\mathrm{NO}}_2+{\mathrm{O}}_2$ Choose the correct answer from the options given below :

1. A.$\mathrm{NO}$, $\mathrm{O}$ & ${\mathrm{O}}_3$
2. B.$\mathrm{N}$, ${\mathrm{O}}_2$ & ${\mathrm{O}}_3$
3. C.$\mathrm{O}$, ${\mathrm{N}}_2\mathrm{O}$ & $\mathrm{NO}$
4. D.$\mathrm{O}$, $\mathrm{NO}$ & ${\mathrm{NO}}_3^{-}$

Correct statement about smog is :

1. A.$\mathrm{N}{\mathrm{O}}_2$ is present in classical smog
2. B.Both $\mathrm{N}{\mathrm{O}}_2$ and $\mathrm{S}{\mathrm{O}}_2$ are present in classical smog
3. C.Photochemical smog has high concentration of oxidizing agents
4. D.Classical smog also has high concentration of oxidizing agents

Some reactions of $\mathrm{N}{\mathrm{O}}_2$ relevant to photochemical smog formation are $$\mathrm{N}{\mathrm{O}}_2\stackrel{\text{sunlight}}{\to }\mathrm{X}+\mathrm{Y},\mathrm{X}\stackrel{\mathrm{A}}{\to }\mathrm{B}$$ Identify A, B, X and Y :

1. A.$\mathrm{X}=[\mathrm{O}],\mathrm{Y}=\mathrm{NO},\mathrm{A}={\mathrm{O}}_2,\mathrm{B}={\mathrm{O}}_3$
2. B.$\mathrm{X}={\mathrm{N}}_2\mathrm{O},\mathrm{Y}=[\mathrm{O}],\mathrm{A}={\mathrm{O}}_3,\mathrm{B}=\mathrm{NO}$
3. C.$\mathrm{X}=\frac{1}{2}{\mathrm{O}}_2,\mathrm{Y}=\mathrm{N}{\mathrm{O}}_2,\mathrm{A}={\mathrm{O}}_3,\mathrm{B}={\mathrm{O}}_2$
4. D.$\mathrm{X}=\mathrm{NO},\mathrm{Y}=[\mathrm{O}],\mathrm{A}={\mathrm{O}}_2,\mathrm{B}={\mathrm{N}}_2{\mathrm{O}}_3$

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

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

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.

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

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.

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.

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.${\mathrm{N}}_2$

Water sample is called cleanest on the basis of which one of the BOD values given below :

1. A.11 ppm
2. B.15 ppm
3. C.3 ppm
4. D.21 ppm

Green chemistry in day-to-day life is in the use of :

1. A.Chlorine for bleaching of paper
2. B.Large amount of water alone for washing clothes
3. C.Tetrachloroethene for laundry
4. D.Liquified ${\text{CO}}_2$ for dry cleaning of clothes

The statements that are TRUE : (A) Methane leads to both global warming and photochemical smog (B) Methane is generated from paddy fields (C) Methane is a stronger global warming gas than $\mathrm{C}{\mathrm{O}}_2$ (D) Methane is a part of reducing smog Choose the most appropriate answer from the options given below :

1. A.(A), (B), (C) only
2. B.(A) and (B) only
3. C.(B), (C), (D) only
4. D.(A), (B), (D) only

The type of pollution that gets increased during the day time and in the presence of ${\mathrm{O}}_3$ is :

1. A.Oxidising smog
2. B.Global warming
3. C.Acid rain
4. D.Reducing smog

The presence of soluble fluoride ion upto 1 ppm concentration in drinking water, is :

1. A.safe for teeth
2. B.harmful to skin
3. C.harmful for teeth
4. D.harmful to bones

The incorrect statement(s) among (a) – (d) regarding acid rain is (are) : (a) It can corrode water pipes. (b) It can damage structures made up of stone. (c) It cannot cause respiratory ailments in animals. (d) It is not harmful for trees

1. A.(c) and (d)
2. B.(a), (b) and (d)
3. C.(c) only
4. D.(a), (c) and (d)

Among the gases (a) – (e), the gases that cause greenhouse effect are : (a) $\mathrm{C}{\mathrm{O}}_2$ (b) ${\mathrm{H}}_2\mathrm{O}$ (c) CFCs (d) ${\mathrm{O}}_2$ (e) ${\mathrm{O}}_3$

1. A.(a), (b), (c) and (d)
2. B.(a) and (d)
3. C.(a), (b), (c) and (e)
4. D.(a), (c), (d) and (e)

The correct set of species responsible for the photochemical smog is :

1. A.$\text{NO},{\text{NO}}_2,{\text{O}}_3$ and hydrocarbons
2. B.${\text{N}}_2,{\text{NO}}_2$ and hydrocarbons
3. C.${\text{CO}}_2,{\text{NO}}_2,{\text{SO}}_2$ and hydrocarbons
4. D.${\text{N}}_2,{\text{O}}_2,{\text{O}}_3$ and hydrocarbons

The primary pollutant that leads to photochemical smog is :

1. A.acrolein
2. B.ozone
3. C.sulphur dioxide
4. D.nitrogen oxides

The ratio of number of atoms present in a simple cubic, body centered cubic and face centered cubic structure are, respectively :

1. A.8 : 1 : 6
2. B.4 : 2 : 1
3. C.1 : 2 : 4
4. D.4 : 2 : 3

Air pollution that occurs in sunlight is :

1. A.oxidising smog
2. B.reducing smog
3. C.fog
4. D.acid rain