Environmental Chemistry JEE Mains Questions. We covered all the Environmental Chemistry JEE Mains Questions in this post for free so that you can practice well for the exam.
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Environmental Chemistry JEE Mains Questions for Students
Photochemical smog is a result of the reaction among
(a) High concentrations of NO₂, O3 and CO in the evening.
(b) CO, CO₂ and NO₂ at low temperatures.
(c) CO, O₂ and peroxy acetyl nitrate in the presence of Sunlight.
(d) NO₂, O3 and peroxy acetyl nitrate in the presence of Sunlight.
Option d – NO₂, O3 and peroxy acetyl nitrate in the presence of Sunlight
Which one of the following is a cause of acid rain? ( Environmental Chemistry JEE Mains MCQ )
(a) Ozone
(b) Ammonia
(c) Sulphur dioxide
(d) Carbon monoxide
Option c – Sulphur dioxide
Acid rain is specified when the pH is
(a) below 7
(b) below 5.6
(c) above 7
(d) above 9
Option b – below 5.6
Acid rain can be reduced by the use of ( Environmental Chemistry JEE Mains MCQ )
(a) LPG
(b) CNG
(c) Both of these
(d) None of these
Option c – Both of these
Which reaction is not a part of Acid-rain?
(a) CO₂ + H₂O → H₂CO3
(b) SO3 + H₂O → H₂SO4
(c) NO₂ + O₂ + H₂O → HNO3
(d) CIONO₂ + H₂O → HOCI + HNO3
Option d – CIONO₂ + H₂O → HOCI + HNO3
Acid rain is caused due to pollution of the atmosphere by ( Environmental Chemistry JEE Mains MCQ )
(a) oxides of carbon and nitrogen
(b) oxides of nitrogen and sulphur
(c) oxides of nitrogen and phosphorous
(d) None of the above
Option b – oxides of nitrogen and sulphur
Smog can be controlled by
(a) the use of catalytic converters in automobiles.
(b) setting the air-fuel ratio in the engine in a such way as to produce some CO and unburned hydrocarbons.
(c) Both of the above
(d) None of the above
Option c – Both of the above
Consider the following assertion and reason and select the correct answer from the codes given below. Assertion (A) Ozone kills microorganisms in the water. Reason (R) Ozone is not radioactive. Codes ( Environmental Chemistry JEE Mains MCQ )
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true, but R is not the correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
Option b – Both A and R are true, but R is not the correct explanation of A
Primary pollutants can be
(a) SO2, CO
(b) PAN, O3
(c) Both of these
(d) None of these
Option a – SO2, CO
Secondary pollutants can be ( Environmental Chemistry JEE Mains MCQ )
(a) PAN
(b) O3
(c) Cl
(d) All of these
Option d – All of these
Which of the following is an inorganic gaseous pollutant of air?
(a) Phosgene
(b) Hydrogen cyanide
(c) Hydrogen sulphide
(d) Methane
Option c – Hydrogen sulphide
Air pollution is caused by smoke. Which of the following types of coal produces no smoke on burning? ( Environmental Chemistry JEE Mains MCQ )
(a) Peat
(b) Lignite
(c) Bituminous
(d) Anthracite
Option c – Bituminous
Which one of the following is not included in the National Air Quality Index?
(a) Sulphur
(b) Nitrogen dioxide
(c) Lead
(d) Methane
Option d – Methane
The term ‘brown air’ is used for ( Environmental Chemistry JEE Mains MCQ )
(a) Acid fumes
(b) Photochemical smog
(c) Sulphurous smog
(d) Industrial smog
Option b – Photochemical smog
Smog is essentially caused by the atmospheric presence of
(a) Oxygen and ozone
(b) Ozone and nitrogen
(c) Oxygen and nitrogen
(d) Oxide of nitrogen and sulphur
Option d – Oxide of nitrogen and sulphur
Which are not the constituents of photochemical smog? ( Environmental Chemistry JEE Mains MCQ )
(a) RCHO
(b) RCOR
(c) PAN
(d) CF₂Cl₂
Option d – CF₂Cl₂
Which of the following gas composition is wrong?
(a) 78% nitrogen
(b) 21% oxygen
(c) 0.03-0.05% CO2, argon
(d) None of the above
Option d – None of the above
The ozone layer is present in ( Environmental Chemistry JEE Mains MCQ )
(a) the troposphere
(b) the ionosphere
(c) the stratosphere
(d) the exosphere
Option c – the stratosphere
The ozone layer of the upper atmosphere is being destroyed by which of the following?
(a) Sulphur dioxide
(b) Photochemical oxidants
(c) Chlorofluorocarbons
(d) Smog
Option c – Chlorofluorocarbons
Which region of the atmosphere has human beings along with another organism? ( Environmental Chemistry JEE Mains MCQ )
(a) Stratosphere
(b) Troposphere
(c) Hydrosphere
(d) Mesosphere
Option b – Troposphere
The gaseous envelope around the earth is known as the atmosphere. The lowest layer of this is extended upto 10 km from sea level, this layer is
(a) stratosphere
(b) troposphere
(c) mesosphere
(d) hydrosphere
Option b – troposphere
Acid rain in some industrial cities is due to the effect of atmospheric pollution caused by ……….
(A) excessive release of CO₂ by burning fuels like wood and charcoal, cutting off forests, etc.
(B) excessive release of NO₂ and SO₂ in the atmosphere by the burning of fossil fuels
(C) excessive release of NH3 by industrial plants and coal gas
(D) excessive release of CO in the atmosphere by incomplete combustion of coke, charcoal, and other carbonaceous fuel in the presence of oxygen
Option b – excessive release of NO₂ and SO₂ in the atmosphere by the burning of fossil fuels
The ozone layer is present in which of the following region(s) of the atmosphere? (i) Stratosphere (ii) Hydrosphere (iii) Mesosphere (iv) Troposphere
(A) Both (i) and (ii)
(B) Both (i) and (iv)
(C) Both (ii) and (iii)
(D) Only (i)
Option d – Only (i)
Leakage of which of the following gas from the Union Carbide plant in Bhopal led to the most disastrous gas tragedy?
(A) Carbon monoxide
(B) Phosgene
(C) Sulphur dioxide
(D) Methyl isocyanate
Option d – Methyl isocyanate
Which one among the following metals interferes with the development and maturation of red blood cells?
(A) Iron
(B) Lead
(C) Copper
(D) Zinc
Option b – Lead
Which of the following is an excellent green solvent as well as a greenhouse gas?
(A) Freons
(B) Methanol
(C) CO
(D) CO₂
Option d – CO₂
Which of the following statements is NOT CORRECT regarding the greenhouse effect?
(A) It is due to the high concentration of CO₂ in the atmosphere.
(B) It is influenced by gases such as CH4, O3, and chlorofluorocarbons.
(C) It is responsible for the increasing temperature of the earth.
(D) It is responsible for lowering the level of oceans due to high evaporation.
Option d – It is responsible for lowering the level of oceans due to high evaporation.
………. do not release oxides of nitrogen in the atmosphere.
(A) Bacterial decay of organic matter by soil micro-organisms
(B) Action of aerobic and anaerobic bacteria on fertilizers
(C) Volcanic eruptions
(D) Combustion of fuel at high temperature
Option c – Volcanic eruptions
When fertilizers containing phosphates enter into water bodies, it causes ……….
(A) enhanced growth of algae
(B) increase in the amount of dissolved oxygen in the water
(C) deposition of calcium phosphate
(D) increase in the fish population
Option a – enhanced growth of algae
SO₂ causes ……….
(A) respiratory and lung diseases
(B) acid rain
(C) corrosion of building materials
(D) all of these
Option d – all of these
Chlorofluorocarbon releases which of the following radicals or compounds that lead to the destruction of ozone?
(A) Fluorine radical
(B) Chlorine radical
(C) Nitrogen dioxide
(D) Carbon dioxide
Option b – Chlorine radical
Photochemical smog can be controlled by which of the following methods? (i) Plantation of plants like Pinus. (ii) Controlling the release of CO2, SO₂, and smoke. (iii) Controlling the release of NO₂ hydrocarbons, ozone, etc. (iv) Use of catalytic converters in automobiles.
(A) Only (i), (iii), and (iv)
(B) Only (ii) and (iv)
(C) Only (i) and (iv)
(D) All of these
Option a – Only (i), (iii), and (iv)
Which of the following is used as a green solvent for dry cleaning purposes?
(A) Polychlorinated biphenyls
(B) Liquid CO₂
(C) Ethanal
(D) Tetrachloroethene
Option b – Liquid CO₂
……… are responsible for the greenhouse effect.
(A) UV rays
(B) Infrared rays
(C) Green plants
(D) Gamma rays
Option b – Infrared rays
Which of the following leads to an increase in BOD?
(A) Purification of water using oxidants
(B) Decrease of organic matter in water
(C) Release of a large quantity of sewage into water
(D) Both (A) and (B)
Option c – Release of a large quantity of sewage into water
Choose the CORRECT pair.
(A) CO₂-Carcinogenic
(B) SO₂-Retard the rate of photosynthesis
(C) Hydrocarbons – Ageing of plants
(D) NO₂ – Leads to suffocation by binding with hemoglobin
Option c – Hydrocarbons – Ageing of plants
Which of the following statement is INCORRECT about classical smog?
(A) It contains smoke, fog, and sulphur dioxide
(B) It is produced in cold and humid climates.
(C) It contains compounds of a reducing nature.
(D) Its main components are produced by the action of sunlight on emissions from automobiles and factories.
Option d – Its main components are produced by the action of sunlight on emissions from automobiles and factories.
Which of the following is NOT classified under non-biodegradable wastes?
(A) Sewage
(B) Pesticides
(C) Plastic
(D) Mercury
Option a – Sewage
………. is NOT a particulate pollutant.
(A) Ozone
(B) Fume
(C) Mist
(D) Smoke
Option a – Ozone
………. is the major source that releases carbon monoxide into the air.
(A) Respiration of living organisms
(B) Photosynthesis carried out by plants
(C) Vehicular exhaust
(D) Decay of dead organisms
Option c – Vehicular exhaust
The lowest layer of the atmosphere is known as ………
(A) stratosphere
(B) troposphere
(C) mesosphere
(D) hydrosphere
Option b – troposphere
What is DDT among the following?
(A) Radioactive pollutant
(B) A fertilizer
(C) Biodegradable pollutant
(D) Non-biodegradable pollutant
Option a – Radioactive pollutant
Gases that are referred to as “greenhouse gases” are ……..
(A) CO2, O3, NO2, NH3
(B) chlorofluorocarbons, CO2, SO2, NO2
(C) CH4, N2, CO2, NH3
(D) chlorofluorocarbons, CO2, CH4, N₂O
Option d – chlorofluorocarbons, CO2, CH4, N₂O
Decolourization of leaves is due to ………
(A) bleaching by chlorine
(B) reduction by chlorofluorocarbons
(C) bleaching by sulphur dioxide
(D) oxidation by CO₂
Option c – bleaching by sulphur dioxide
Which among the given pair of gases is responsible for the destruction of the ozone layer?
(A) CO, SO2
(B) NO, NO2
(C) N2, O2
(D) SO2, SO3
Option b – NO, NO2
Which of the following is NOT a measure to control environmental pollution?
(A) Biological oxidation of organic wastes by micro-organisms.
(B) Use of CNG as an alternative to petrol and diesel.
(C) Avoiding the use of biodegradable materials.
(D) Use of catalytic converters in automobiles.
Option c – Avoiding the use of biodegradable materials.
Classical smog is a mixture of ……….
(A) fumes, fog, and NO₂
(B) smoke, dust particles, and SO₂
(C) mists, smoke, and fog
(D) fumes, smoke, and mists
Option b – smoke, dust particles, and SO₂
Which of the following statement is INCORRECT?
(A) Acid rain enhances the activity of symbiotic nitrogen-fixing bacteria.
(B) The ions present in acid rain leach nutrients from the soil.
(C) Acid rain may cause neurological disorders in human beings.
(D) Change in the pH of water bodies due to acid rain adversely affects aquatic life.
Option a – Acid rain enhances the activity of symbiotic nitrogen-fixing bacteria.
Which of the following is NOT a constituent o t of photochemical smog?
(A) Acrolein
(B) Peroxyacetyl nitrate
(C) Hydrogen sulphide
(D) Ozone
Option c – Hydrogen sulphide
Another name for chlorofluorocarbons is ………
(A) freons
(B) acrolein
(C) peroxyacetyl nitrate
(D) ferrocene
Option a – freons
High concentrations of fluoride ions in drinking water may lead to which of the following condition/disease?
(A) Methemoglobinemia
(B) Scurvy
(C) Fluorosis
(D) Goitre
Option c – Fluorosis
Which of the following is an example of a primary air pollutant?
(A) NO
(B) HNO3
(C) NO₂
(D) H₂O₂
Option a – NO
Which of the following is NOT a primary air pollutant?
(A) SO₂
(B) CO
(C) O3
(D) NO2
Option c – O3
Which are the primary constituents of photochemical smog?
(A) SO₂ and CO
(B) NO₂ and hydrocarbons
(C) CO₂ and NO₂
(D) Hydrocarbons and CFCs
Option b – NO₂ and hydrocarbons
The molecular formula of PAN is ……….
(A) CH3-COONO2
(B) CH3-COO₂NO₂
(C) H-COONO₂
(D) CH₂=CH-CH=0
Option b – CH3-COO₂NO₂
Which of the following property of synthetic reactions are preferably carried water, out in an aqueous medium? (i) Low specific heat (ii) Low volatility (iii) High specific heat (iv) High volatility
(A) (i) and (ii)
(B) (i) and (iv)
(C) (ii) and (iv)
(D) (ii) and (iii)
Option d – (ii) and (iii)
Which of the following does NOT cause air pollution?
(A) Thermal power plant
(B) Automobile
(C) Nuclear power plant
(D) Hydroelectric power plant
Option d – Hydroelectric power plant
Increased concentration of CO₂ in the atmosphere is responsible for ………..
(A) greenhouse effect
(B) acid rain
(C) reduced rate of photosynthesis
(D) death of aquatic life
Option a – greenhouse effect
Which of the following is a type of viable particulate?
(A) moulds
(B) smoke
(C) dust
(D) mists
Option a – moulds
Classical smog and photochemical smog are also known as ……… and ……….. smog respectively.
(A) oxidizing, reducing
(B) physical, chemical
(C) reducing, reducing
(D) reducing, oxidizing
Option d – reducing, oxidizing
Depletion of the ozone layer may eventually lead to ………. (i) cardiovascular disorder (ii) killing of phytoplanktons (iii) skin cancer (iv) aging of the skin
(A) Only (ii) and (iv)
(B) Only (iii) and (iv)
(C) Only (ii), (iii), and (iv)
(D) Only (ii) and (iii)
Option c – Only (ii), (iii) and (iv)
Which of the following leads to the production of CO₂? ( Environmental Chemistry MCQ )
(A) Manufacture of lime from limestone
(B) Photosynthesis by plants
(C) Afforestation
(D) Both (A) and (B)
Option a – Manufacture of lime from limestone
What can be inferred from the following reaction? HbO8+CO—> HbCO+4O2 (Hb = Haemoglobin)
(A) Carbon monoxide carrying capacity of hemoglobin is decreased.
(B) The oxygen-carrying capacity of hemoglobin is increased.
(C) The oxygen-carrying capacity of hemoglobin is decreased.
(D) The addition of more oxygen will lead to its combination with hemoglobin.
Option c – The oxygen-carrying capacity of hemoglobin is decreased.
DDT enters the aquatic food chain through which of the following component? ( Environmental Chemistry MCQ )
(A) Zooplankton
(B) Minnows
(C) Tuna fish
(D) Whale
Option a – Zooplankton
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