Please refer to Chapter 14 Environmental Chemistry MCQ Class 11 Chemistry with answers below. These multiple-choice questions have been prepared based on the latest NCERT book for Class 11 Chemistry. Students should refer to MCQ Questions for Class 11 Chemistry with Answers to score more marks in Grade 11 Chemistry exams. Students should read the chapter Environmental Chemistry and then attempt the following objective questions.

MCQ Questions Class 11 Chemistry Chapter 14 Environmental Chemistry

The V MCQ Class 11 Chemistry provided below covers all important topics given in this chapter. These MCQs will help you to properly prepare for exams.

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

Question. Among the following compounds, which one is not responsible for the depletion of ozone layer? 
(a) CH₄
(b) CFCI₃
(c) NO
(d) CI₂         

Question. Which of the following is responsible for the depletion of the ozone layer in the upper strata of the atmosphere?
(a) Polyhalogens
(b) Ferrocenes 
(c) Fullerenes
(d) Freons       

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

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 radiations of the sun
(c) Depletion of ozone layer is because of its chemical reactions with chlorofluoroalkanes
(d) Ozone absorbs infrared radiations       

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

Question. Which compound is mainly responsible for the depletion of ozone layer?
(a) CO₂
(b) CH₄
(c) CH₃OH
(d) CF₂Cl₂     

Question. The photochemical smog can be suppressed by 
(a) nitrogen oxides
(b) hydrocarbons
(c) radical traps
(d) formaldehyde
(e) peroxyacetyl nitrate       

Question. Green house effect is caused by
(a) NO₂
(b) CH
(c) NO
(d) CO₂     

Question. Use of chlorofluorocarbons is not encouraged because
(a) they are harmful to the eyes of people that use it
(b) they damage the refrigerators and air conditioners
(c) they eat away the ozone in the atmosphere
(d) they destroy the oxygen layer     

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

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. In which part of the atmosphere, ozone layer is present?
(a) Stratosphere
(b) Troposphere 
(c) Mesosphere
(d) Thermosphere     

Question. Pick out the correct statement. 
(a) CO which is major pollutant resulting from the combustion of fuels in automobiles plays a major role in photochemical smog
(b) Classical smog has an oxidising character while the photochemical smog is reducing in character
(c) Photochemical smog occurs in day time whereas the classical smog occurs in early morning homs
(d) During formation of smog the level of ozone in the atmosphere goes down
(e) Classical smog is good for health but not photochemical smog       

Question. Which of the following is not an air pollutant?
(a) N₂
(b) N₂O
(c) NO
(d) CO     

Question. Which of the following is a measurement of water pollution? 
(a) PSC
(b) PCB
(c) BOD
(d) COD     

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
(e) Formaldehyde       

Question. The gas that is not considered as a ‘green house gas’ is
(a) CO₂
(b) CH₄ 
(c) O₂
(d) O₃     

Question. CFCI₂ is responsible for the decomposition of ozone to oxygen. Which of the following reacts with ozone to form oxygen?
(a) Cl₂
(b) Cl^–
(c) p^–
(d) Cl       

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 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 is secondary pollutant? 
(a) CO₂
(b) N₂O
(c) PAN
(d) SO₂       

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