MCQs For NCERT Class 11 Chemistry Chapter 14 Environmental Chemistry

Please refer to the MCQ Questions for Class 11 Chemistry Chapter 14 Environmental Chemistry with Answers. The following Environmental Chemistry Class 11 Chemistry MCQ Questions have been designed based on the latest syllabus and examination pattern for Class 11. Our experts have designed MCQ Questions for Class 11 Chemistry with Answers for all chapters in your NCERT Class 11 Chemistry book.

Environmental Chemistry Class 11 MCQ Questions with Answers

See below Environmental Chemistry Class 11 Chemistry MCQ Questions, solve the questions and compare your answers with the solutions provided below. 

Question. Select the process that does not add particulate materials to air.                                 
(a) Use of air conditioner
(b) Burning of fosssil fuels
(c) Paper industry
(d) Incomplete combustion of coal

Question. The biggest particulate matter is                                   
(a) HNO₃ droplets
(b) Soot
(c) H₂SO₄ droplets
(d) Fly ash

Question. The viable particulate among the following is                             
(a) Fumes
(b) Algae
(c) Smoke
(d) Mist

Question. The aromatic compounds present as particulates are                               
(a) Polycyclic aromatic hydrocarbons
(b) Benzene
(c) Toluene
(d) Nitrobenzene

Question. The main element of smog is                                   
(a) O₃ and PAN
(b) O₃
(c) PAN
(d) Both (a) and (b)

Question. Which of the following statements is not true about classical smog?                                       
(a) Its main components are produced by the action of sunlight on emissions of automobiles and factories.
(b) Produced in cold and humid climate.
(c) It contains compounds of reducing nature.
(d) It contains smoke fog and sulphur dioxide

Question. Which of the following can control the photochemical smog ?                                     
(A) Use of catalytic converters in automobiles.
(B) Plantation of trees like pinus, pyrus vitis etc.
(C) Using less sulphur containing fossil fuels.
(a) A and C
(b) B
(c) A and B
(d) A, B and C

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

Question. Which of the following chemical, harmful to ozone, is released by chlorofluoro carbon?                               
(a) Sulphur dioxide
(b) Fluorine
(c) Chlorine
(d) Nitrogen dioxide

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

Question. Depletion of ozone layer causes                                       
(a) breast cancer
(b) blood cancer
(c) lung cancer
(d) skin cancer

Question. The gas responsible for ozone depletion :                                       
(a) NO and freons
(b) SO₂
(c) CO₂
(d) CO

Question. Identify the incorrect statement from the following :                                   
(a) Ozone absorbs the intense ultraviolet radiation of the sun.
(b) Depletion of ozone layer is because of its chemicalreactions with chlorofluoro alkanes. 
(c) Ozone absorbs infrared radiation.
(d) Oxides of nitrogen in the atmosphere can cause thedepletion of ozone layer. 

Question. Select the one that has an adverse effect on ozone layer.                                     
(a) Carbon dioxide
(b) Chlorofluorocarbons
(c) Soil
(d) Dust particles

Question. Ozone hole refers to                               
(a) Increase in concentration of ozone                               
(b) Hole in ozone layer
(c) Reduction in thickness of ozone layer in troposphere
(d) Reduction in thickness of ozone layer in stratsophere

Question. Ozone is an important constituent of stratosphere because it                       
(a) Destroys bacteria which are harmful to human life
(b) Prevents the formation of smog over large cities
(c) Removes poisonous gases of the atmosphere by reacting with them
(d) Absorbs ultraviolet radiation which is harmful to human life

Question. The gas(es) not responsible for ozone depletion :                           
(a) NO and freons
(b) SO₂
(c) CO₂ (d) Both
(b) and (c)

Question. What is the concentration of dissolved oxygen in cold water ?                                 
(a) 5 ppm
(b) 10 ppm
(c) 200, 000 ppm
(d) 100 ppm

Question. Water pollution is caused by                                       
(a) pesticides
(b) SO₂
(c) O₂
(d) CO₂

Question. Minamata disease of Japan is due to pollution of                               
(a) Aresenic
(b) Lead
(c) Cynide
(d) Mercury

Question. Which of the following statements is wrong?                                 
(a) Ozone is not responsible for green house effect.
(b) Ozone can oxidise sulphur dioxide present in the atmosphere to sulphur trioxide.
(c) Ozone hole is thinning of ozone layer present in stratosphere.
(d) Ozone is produced in upper stratosphere by the action of UV rays on oxygen.

Question. Which of the following statements is correct?                                         
(a) Ozone hole is a hole formed in stratosphere from which ozone oozes out.
(b) Ozone hole is a hole formed in the troposphere from which ozone oozes out.
(c) Ozone hole is thinning of ozone layer of stratosphere at some places.
(d) Ozone hole means vanishing of ozone layer aroundthe earth completely. 

Question. The high amount of E. coli in water is the indicator of                                     
(a) hardness of water
(b) industrial pollution
(c) sewage pollution
(d) presence of chlorine in water

Question. A lake with an inflow of domestic sewage rich in organic waste may result in                                   
(a) drying of the lake very soon due to algal bloom
(b) an increase production of fish due to lot of nutrients
(c) death of fish due to lack of oxygen
(d) increased population of aquatic food web organisms

Question. Which of the following does not occur when the sewage is discharged into water ?                                 
(a) Increase in O₂
(b) Cyanophycean blooms occur
(c) Depletion of O₂ layers
(d) Eutrophication

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. Sewage water is purified by                                 
(a) aquatic plants
(b) microoganisms
(c) light
(d) fishes

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

Question. Which causes death of fish in water bodies polluted by sewage?                             
(a) Foul smell
(b) Pathogens
(c) Herbicides
(d) Decrease in D.O.

Question. B.O.D. test or biochemical oxygen demand test is made for measuring                             
(a) air pollution
(b) water pollution
(c) noise pollution
(d) soil pollution

Question. Which of the following metal is a water pollutant and causes sterility in human being                               
(a) As
(b) Mn
(c) Mg
(d) Hg

Question. Sewage mostly constitutes                                 
(a) Non-biodegradable pollutants
(b) Biodegradable pollutants
(c) Effluents
(d) Air pollutants

Question. Brewery and sugar factory waste alters the quality of a water body by increasing                           
(a) temperature
(b) turbidity
(c) pH
(d) COD and BOD

Question. Biochemical Oxygen Demand, (BOD) is a measure of organic material present in water. BOD value less than 5 ppm indicates a water sample to be __________.             
(a) rich in dissolved oxygen
(b) poor in dissolved oxygen
(c) highly polluted
(d) not suitable for aquatic life

Question. Phosphate fertilizers when added to water leads to                                 
(a) Increased growth of decomposers
(b) Reduced algal growth
(c) Increased algal growth
(d) Nutrient enrichment (eutrophication)

Question. BOD of pond is connected with                                 
(a) Microbes & organic matter
(b) Organic matter
(c) Microbes
(d) None of these

Question. The maximum prescribed concentration of cadmium indrinking water in ppm is                             
(a) 0.05
(b) 3
(c) 2
(d) 0.005

Question. Excess nitrate in drinking water can cause                                       
(a) methemoglobinemia
(b) kidney damage
(c) liver damage
(d) laxative effect

Question. Which one of the following statement is not true ?                                 
(a) pH of drinking water should be between 5.5 – 9.5.
(b) Concentration of DO below 6 ppm is good for the growth of fish.
(c) Clean water would have a BOD value of less than 5 ppm.
(d) Oxides of sulphur, nitrogen and carbon are the most widespread air pollutant.

Question. Limit of BOD prescribed by Central pollution Control Board for the discharge of industrial and municipal waste waters into natural surface waters, is                     
(a) < 100 ppm
(b) < 30 ppm
(c) < 3.0 ppm
(d) < 10 ppm

Question. Eutrophication causes reduction in                                 
(a) dissolved oxygen
(b) nutrients
(c) dissolved salts
(d) All of the above

Question. Chief source of soil and water pollution is                                   
(a) mining
(b) agro industry
(c) thermal power plant
(d) All of the above

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

Question. The quantity of DDT in food chain                                 
(a) decreases
(b) remains same
(c) increases
(d) changes

Question. The effect of polluted water on soil is, that                     
(a) it decreases fertility
(b) it contaminates ground water
(c) it renders soil acidic or basic
(d) all of the above

Question. Soil is polluted by                               
  I. pesticides
  II. synthetic fertilizers
  III. green manure
Choose the correct option.
(a) I and III
(b) I and II
(c) II and III
(d) I, II and III

Question. Water pollution is caused by                             
(a) pesticides
(b) fly ash
(c) auto exhausts
(d) aeroplanes

Question. Which causes death of fishes in water bodies polluted bysewage?                             
(a) Foul smell
(b) Pathogens
(c) Clogging of gills by silt
(d) Decrease in D.O.

Question. Which of the following trophic level has least concentrationof toxins deposition ?                         
(a) Aquatic plant
(b) Small fish
(c) Human being
(d) Largest fish

Question. Green chemistry means such reactions which :                             
(a) produce colour during reactions
(b) reduce the use and production of hazardous chemicals
(c) are related to the depletion of ozone layer
(d) study the reactions in plants