Students of class 11 Chemistry should refer to MCQ Questions Class 11 Chemistry Environmental Chemistry with answers provided here which is an important chapter in Class 11 Chemistry NCERT textbook. These MCQ for Class 11 Chemistry with Answers have been prepared based on the latest CBSE and NCERT syllabus and examination guidelines for Class 11 Chemistry. The following MCQs can help you to practice and get better marks in the upcoming class 11 Chemistry examination

Chapter 14 Environmental Chemistry MCQ with Answers Class 11 Chemistry

MCQ Questions Class 11 Chemistry Environmental Chemistry provided below have been prepared by expert teachers of grade 11. These objective questions with solutions are expected to come in the upcoming Standard 11 examinations. Learn the below provided MCQ questions to get better marks in examinations.

Question. Carbon monoxide, emitted by automobiles, prevents transport of oxygen in the body due to
(a) combining with oxygen to form carbon dioxide
(b) destruction of haemoglobin
(c) preventing reaction between oxygen and haemoglobin
(d) formation of stable compound with haemoglobin       

Question. Increased UV radiations due to hole in ozone layer
(a) will cause increase in cases of skin diseases
(b) will cause more ice to melt
(c) will cause summer to be more warmer
(d) will cause more rain       

Question. Which of the following is not a pollutant?
(a) Carbon monoxide
(b) Sulphur trioxide
(c) Sulphur dioxide
(d) Nitrogen peroxide       

Question. Which of the following is not considered to be a pollutant?
(a) NO₂
(b) CO₂
(c) O₃
(d) SO₃       

Question. Main pollutant from automobile exhaust is
(a) CO
(b) CO₂
(c) NO
(d) hydrocarbons       

Question. Which of the following pollutants is not emitted during volcanic eruptions?
(a) SO₂
(b) H₂S 
(c) Hydrocarbons
(d) CO         

Question. Ozone hole is maximum over
(a) India
(b) Pakistan
(c) Australia
(d) Antarctica       

Question. The gas leaked from a storage tank of the Union Carbide Plant in Bhopal gas tragedy was 
(a) methylamine
(b) phosgene
(c) ammonia
(d) methyl isocyanate       

Question. The lowest layer of earth’s atmosphere is
(a) troposphere
(b) mesosphere
(c) stratosphere
(d) ionosphere         

Question. Lead pollution is mainly caused by
(a) sewage
(b) insecticide
(c) coal gasoline
(d) None of these       

Question. Which of the following statements is false?
(a) London smog is oxidising in nature
(b) London smog causes bronchitis
(c) London smog is formed in winter
(d) London smog contains H₂SO₄ droplets     

Question. Ultraviolet radiation is absorbed by
(a) exosphere
(b) ionosphere
(c) mesosphere
(d) stratosphere     

Question. The smog is essentially caused by the presence of
(a) O₂ and O₃
(b) O₂ and N₂
(c) oxides of sulphur and nitrogen
(d) O₃ and N₂       

Question. Which of the following protects life on earth from harmful effects of UV radiations from sun?
(a) N₂
(b) CO₂
(c) O₂
(d) O₃         

Question. Pollutants released from iron and steel industry are
(a) CO₂ , NO₂ , H₂S 
(b) CO , CO₂  , SO 
(c) CO₂  , SO₃ , NO₂
(d) CO₂  , NO, SO₃     

Question. SO₂ causes
(a) respiratory and lung disease
(b) acid rain
(c) corrosion of building materials
(d) All of the above       

Question. Ozone has the ability to absorb
(a) UV radiations
(b) electromagnetic radiations
(c) CFC
(d) greenhouse gases         

Question. Identify the incorrect statement from the following.
(a) Oxides of nitrogen in the atmosphere can cause the depletion of ozone layer
(b) Ozone absorbs the intense ultraviolet radiation of the sun
(c) Depletion of ozone layer is because of its chemical reactions with chlorofluoroalkanes
(d) Ozone absorbs infrared radiations         

Question. Persons working in cement plants and limestone quarries are more prone to disease like
(a) asthma
(b) cancer
(c) silicosis
(d) pneumoconiosis         

Question. In Antarctica, ozone depletion is due to the formation of
(a) chlorine nitrate
(b) peroxyacetyl nitrate
(c) SO₂
(d) SO₃       

Question. Which of the following is not a greenhouse gas?
(a) Methane
(b) Carbon dioxide
(c) CFCs
(d) CH₃Br vapour         

Question. Fish die in water-bodies polluted by sewage is due to
(a) pathogens
(b) reduction in oxygen
(c) foul smell
(d) None of these       

Question. Which one of the following is not a common component of photochemical smog?
(a) Ozone
(b) Acrolein
(c) Peroxyacetylnitrate
(d) Chlorofluorocarbons       

Question. Eutrophication of a lake means it
(a) is low in nutrients
(b) is high in nutrients
(c) has excess amount of organic matter
(d) has a high temperature           

Question.  Which of the following statements is wrong?
(a) Polar stratospheric clouds (PSCs) are clouds formed over Antarctica
(b) Acid rain dissolves heavy metals such as Cu, Pb, Hg and Al from soil, rocks and sediments
(c) H₂SO₄ is major contributor to acid rain, HNO₃ ranks second and HCl third in this respect
(d) Fishes grow in warm as well as in cold water         

Question. The ozone layer forms naturally by
(a) the interaction of CFC with oxygen
(b) the interaction of UV radiation with oxygen
(c) the interaction of IR radiation with oxygen
(d) the interaction of oxygen and water vapour             

Question. Ozone depletion in the stratosphere is mainly caused by
(a) SO₂
(b) NO₂
(c) NO
(d) chlorofluorocarbons         

Question. When rain is accompanied by a thunderstorm, the collected rain water will have a pH value
(a) slightly lower than that of rain water without thunderstorm
(b) slightly higher than that of rain water when the thunderstorm is not there
(c) uninfluenced by occurrence of thunderstorm
(d) which depends on the amount of dust in air         

Question. Which of the following does not cause water pollution?
(a) Heavy metals such as Cd, Pb, Hg
(b) Detergents
(c) Polychlorobiphenyls
(d) Freons           

Question. Acid rains are produced by
(a) excess NO₂ and SO₂ from burning fossil fuels
(b) excess production of NH₃ by industry and coal gas
(c) excess release of carbon monoxide by incomplete combustion
(d) excess formation of CO₂ by combustion and animal respiration       

Question. Environmental pollution affects
(a) biotic components
(b) human beings only
(c) plants only
(d) biotic and abiotic components of environment         

Question.  Oxidation of sulphur dioxide into sulphur trioxide in the absence of a catalyst is a slow process but this oxidation occurs easily in the atmosphere. Which substance here catalyse the reaction?
(a) Oxygen
(b) Particulate
(c) UV rays
(d) IR rays                 

Question. What is DDT among the following?
(a) Greenhouse gas
(b) A fertiliser
(c) Biodegradable pollutant
(d) Non-biodegradable pollutant         

Question. Which of the following practices will not come under green chemistry?
(a) If possible, making use of soap made of vegetable oils instead of using synthetic detergents
(b) Using H₂O₂ for bleaching purpose instead of using chlorine based bleaching agents
(c) Using bicycle for travelling small distances instead of using petrol/diesel based vehicles
(d) Using plastic cans for neatly storing substances         

Question.  Which of the following statements about photochemical smog is wrong?
(a) It has high concentration of oxidising agents
(b) It has low concentration of oxidising agents
(c) It can be controlled by controlling the release of NO₂, hydrocarbons, ozone etc
(d) Plantation of some plants like pinus helps in controlling photochemical smog           

Question. Mottling of teeth is due to the presence of which of the following element in drinking water?
(a) Mercury
(b) Fluorine
(c) Boron  
(d) Chlorine       

Question. Identify the incorrect statement in the following.
(a) Chlorofluorocarbons are responsible for ozone layer depletion
(b) Greenhouse effect is responsible for global warming
(c) Ozone layer does not permit infrared radiation from the sun to reach the earth
(d) Acid rain is mostly because of oxides of nitrogen and sulphur           

Question. BOD is
(a) waste decomposed in 5 days
(b) oxygen used in 5 days
(c) microorganisms killed in 5 days
(d) dissolved oxygen left after 5 days         

Question. Which of the following statements about polar stratospheric clouds (PSCs) is not correct?
(a) Type I clouds are formed at about −77°C and contain solid HNO₃ 3H₂O 
(b) Type II clouds are formed at about −85°C and contains some ice
(c) A tight whirlpool of wind called polar vortex is formed which surrounds Antarctica
(d) PSCs do not react with chlorine nitrate and HCl           

Question. The basic component of smog is
(a) PAN
(b) PBN
(c) NO₂
(d) All of these           

Question. Sewage water is purfied by
(a) microorganism
(b) fishes
(c) aquatic plants
(d) All of these                 

Question. Sewage containing organic waste should not be disposed in water-bodies because it causes major
water pollution. Fishes in such a polluted water die because of
(a) large number of mosquitoes
(b) increase in the amount of dissolved oxygen
(c) decrease in the amount of dissolved oxygen in water
(d) clogging of gills by mud         

Question. Which of the following statements is false?
(a) The main reason for river water pollution is industrial and domestic sewage discharge
(b) Surface water contains a lot of organic matter, mineral nutrients and radioactive materials
(c) Oil spill in sea water causes heavy damage to fishery
(d) Oil slick in a sea water increases DO value           

Question. Drawback of DDT as pesticides is that
(a) it is less effective than others
(b) it becomes ineffective after some time
(c) it is a non-biodegradable substance
(d) it is very costly           

Question. For dry cleaning, in the place of tetrachloroethene, liquefied carbon dioxide with suitable detergent is an alternative solvent. What type of harm to the environment will be prevented by stopping use of tetrachloroethene?
(a) It results in tropospheric pollution
(b) It causes depletion of ozone layer
(c) It causes particulate pollution
(d) Both (a) and (b)             

Question.  Negative soil pollution is
(a) reduction in soil productivity due to erosion and over use
(b) reduction in soil productivity due to addition of pesticides and industrial wastes
(c) converting fertile land into barren land by dumping ash, sludge and garbage
(d) None of the above           

Question. Average ozone concentration in Jakarta, Indonesia have been reported to be 0.015 mg m⁻³ and those in Tokyo, Japan are 20 ppmV. What is the approximate ratio of these two values, when expressed in the same unit?
(a) 1:0.3
(b) 1: 3
(c) 1: 33
(d) 1: 2             

Question. Green chemistry involves
(a) production of chemicals of our daily use from green house gases
(b) such chemical processes in which green plants are used
(c) those reactions which are of biological origin
(d) use of non-toxic reagents and solvents to produce       

Question. The pollutants which come directly in the air from sources are called primary pollutants. Primary pollutants are sometimes converted into secondary pollutants. Which of the following belongs to secondary air pollutants?
(a) CO
(b) Hydrocarbon
(c) Peroxyacetyl nitrate
(d) NO         

Question. Water is treated with chlorine to
(a) increase oxygen content
(b) increase taste
(c) remove suspended particles
(d) kill germs        

We hope the above multiple choice questions for Class 11 Chemistry for Chapter 14 Environmental Chemistry provided above with answers based on the latest syllabus and examination guidelines issued by CBSE, NCERT and KVS are really useful for you. Environmental Chemistry is an important chapter in Class 11 as it provides very strong understanding about this topic. Students should go through the answers provided for the MCQs after they have themselves solved the questions. All MCQs have been provided with four options for the students to solve. These questions are really useful for the benefits of class 11 students. Please go through these and let us know if you have any feedback in the comments section.