Please refer to MCQ Questions Environmental Chemistry for Chapter 14 Class 11 Chemistry given below. All MCQ questions are provided with answers. These MCQ Questions for Class 11 Chemistry are designed based on the chapters given in your CBSE NCERT Textbook for Class 11 Chemistry. These MCQ Questions are expected to come in your class 11 Board exams.
Question. Which oxide of nitrogen is not a common pollutant introduced into the atmosphere both due to natural and human activity?
(a) N2O5
(b) NO2
(c) N2O
(d) NO
Answer
A
Question. Which of the following is a sink for CO?
(a) Microorganisms present in the soil
(b) Oceans
(c) Plants
(d) Haemoglobin
Answer
A
Question. Which one of the following is not a common component of photochemical smog?
(a) Ozone
(b) Acrolein
(c) Peroxyacetyl nitrate
(d) Chlorofluorocarbons
Answer
D
Question. Which of the following is not correct about carbon monoxide?
(a) It forms carboxyhaemoglobin.
(b) It reduces oxygen carrying ability of blood.
(c) The carboxyhaemoglobin (haemoglobin bound to CO) is less stable than oxyhaemoglobin.
(d) It is produced due to incomplete combustion.
Answer
C
Question. Among the following, the one that is not a greenhouse gas is
(a) sulphur dioxide
(b) nitrous oxide
(c) methane
(d) ozone.
Answer
A
Question. About 20 km above the earth, there is an ozone layer. Which one of the following statements about ozone and ozone layer is true?
(a) It is beneficial to us as it stops U.V. radiation.
(b) Conversion of O3 to O2 is an endothermic reaction.
(c) Ozone is a triatomic linear molecule.
(d) It is harmful as it stops useful radiation.
Answer
A
Question. Which one of the following statements is not true?
(a) Clean water would have a BOD value of 5 ppm.
(b) Fluoride deficiency in drinking water is harmful. Soluble fluoride is often used to bring its concentration upto 1 ppm.
(c) When the pH of rain water is higher than 6.5, it is called acid rain.
(d) Dissolved Oxygen (DO) in cold water can reach a concentration upto 10 ppm.
Answer
C
Question. Which one of the following statements regarding photochemical smog is not correct?
(a) Carbon monoxide does not play any role in photochemical smog formation.
(b) Photochemical smog is an oxidising agent in character.
(c) Photochemical smog is formed through photochemical reaction involving solar energy.
(d) Photochemical smog does not cause irritation in eyes and throat.
Answer
D
Question. Green chemistry means such reactions which
(a) are related to the depletion of ozone layer
(b) study the reactions in plants
(c) produce colour during reactions
(d) reduce the use and production of hazardous chemicals.
Answer
D
Question. Which one of the following is responsible for depletion of the ozone layer in the upper strata of the atmosphere?
(a) Polyhalogens
(b) Ferrocene
(c) Fullerenes
(d) Freons
Answer
D
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
Answer
B
Question. The type of pollution caused by spraying of DDT is
(a) air and soil
(b) air and water
(c) air
(d) air, water and soil
Answer
D
Question. Which of the following is the coldest region of atmosphere ?
(a) Thermosphere
(b) Mesosphere
(c) Troposphere
(d) Stratosphere
Answer
B
Question. The region which is greatly affected by air pollution is
(a) Thermosphere
(b) Stratosphere
(c) Troposphere
(d) Mesosphere
Answer
C
Question. The region containing water vapour is
(a) thermosphere
(b) stratosphere
(c) troposphere
(d) mesosphere
Answer
C
Question. High concentration of which of the following in atmosphere leads to stiffness of flower buds which eventually fall off from plants?
(a) NO2
(b) SO2
(c) CFC
(d) Smog
Answer
B
Question. What is DDT among the following ?
(a) Greenhouse gas
(b) A fertilizer
(c) Biodegradable pollutant
(d) Non-biodegradable pollutant
Answer
D
Question. The uppermost region of the atmosphere is called
(a) Ionosphere
(b) Stratosphere
(c) Troposphere
(d) Exosphere
Answer
D
Question. The irritant red haze in the traffic and congested placesis due to presence of which of the following ?
(i) Oxides of sulphur
(ii) Oxides of nitrogen
(iii) Carbon dioxide
(iv) Mists, smoke and dust
(v) Smog
(a) (i), (iv) and (v)
(b) (iii) only
(c) (ii) only
(d) (ii) and (v)
Answer
C
Question. Which of the following is/are the hazardous pollutant(s)present in automobile exhaust gases?
(i) N2 (ii) CO
(iii) CH4 (iv) Oxides of nitrogen
(a) (ii) and (iii)
(b) (i) and (ii)
(c) (ii) and (iv)
(d) (i) and (iii)
Answer
C
Question. The gas emitted by supersonic jet planes that slowly depletes the concentration of ozone layer is
(a) CO
(b) NO
(c) SO2
(d) O2
Answer
B
Question. Carbon monoxide (CO) is harmful to man because
(a) it forms carbolic acid
(b) it generates excess CO2
(c) it is carcinogenic
(d) it competes with O2 for haemoglobin
Answer
D
Question. Increase in global temperature increases the incidence of which of the following infectious disease(s)
(i) Sleeping sickness (ii) Yellow fever
(iii) Malaria (iv) Dengue
(a) (ii) only (b) (i) and (ii)
(c) (iii) and (iv)
(d) (i), (ii), (iii) and (iv)
Answer
D
Question. The green house effect is caused by
(a) CO2
(b) NO2
(c) NO
(d) CO
Answer
A
Question. The quantity of CO2 in atmosphere is
(a) 3.34%
(d) 6.5%
(c) 0.034%
(d) 0.34%
Answer
C
Question. The substance which is not regarded as a pollutant?
(a) NO2
(b) CO2
(c) O3
(d) Hydrocarbons
Answer
B
Question. Which is related to ‘Green House Effect’?
(a) Farming of Green plants
(b) Farming of Vegetables in Houses
(c) Global Warming
(d) Biodegradable pollutant
Answer
C
Question. The greenhouse effect is because of the
(a) presence of gases, which in general are strong infraredabsorbers, in the atmosphere
(b) presence of CO2 only in the atmosphere
(c) pressure of O3 and CH4 in the atmosphere
(d) N2O and chlorofluorohydrocarbons in the atmosphere
Answer
A
Question. The greenhouse gas is
(a) CO2
(b) SO2
(c) N2
(d) H2S
Answer
A
Question. Which of the following gases is not a green house gas?
(a) CO
(b) O3
(c) CH4
(d) H2O vapour
Answer
A
Question. Which of the following strategy is not a correct approachto reduce global warming ?
(a) Reducing the green house gas emission by limiting the use of fossil fuels
(b) Increase the vegetation cover particularly the forest for photosynthetic utilization of CO2
(c) Minimizing the use of nitrogen fertilizers in agriculture for reducing N2O emission
(d) Increasing the use of air conditioners, refrigeration unit and production of plastic foams and propellants in aerosal spray cans
Answer
D
Question. The substance having the largest concentration in acid rain
(a) H2CO3
(b) HNO3
(c) HCl
(d) H2SO4
Answer
D
Question. Green house gases
(a) allow shorter wavelength to enter earth’s atmosphere while doesn’t allow longer wavelength to leave the earth’s atmosphere.
(b) allow longer wavelength to enter earth atmosphere while doesn’t allow shorter wavelength to leave the surface
(c) don’t have wavelength specific character.
(d) show wavelength specific behaviour near the earthwhile far from earth these have wavelength independent behaviour.
Answer
A
Question. Today the concentration of green house gases is very high because of
(a) use of refrigerator
(b) increased combustion of oils and coal
(c) deforestation
(d) All of the above
Answer
D
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 withoutthunderstorm
(b) slightly higher than that when the thunderstorm is not there
(c) uninfluenced by occurrence of thunderstorm
(d) which depends upon the amount of dust in air
Answer
A
Question. Which of the following statements is incorrect ?
(a) Smoke particulates consist of solid or mixture of solid and liquid particles formed during combustion of organic matter.
(b) Herbicides and insecticides that miss their target and travel through air form mists.
(c) Organic solvents, metals and metallic oxides form fume particles
(d) None of these
Answer
D
Question. Photochemical smog is due to the presence of
(a) oxides of sulphur
(b) oxides of nitrogen
(c) oxides of carbon
(d) lead
Answer
B
Question. The secondary precursors of photochemical smog are
(a) SO2 and NO2
(b) SO2 and hydrocarbons
(c) NO2 and hydrocarbons
(d) O3 and PAN
Answer
D
Question. The main element of smog is
(a) O3 and PAN
(b) O3
(c) PAN
(d) PPN and PBN
Answer
A
Question. Acid rain is due to
(a) CH3
(b) N2O5
(c) SO2 and NO2
(d) C2H5OH
Answer
C
Question. The pH of normal rain water is
(a) 6.5
(b) 7.5
(c) 5.6
(d) 3.5
Answer
C
Question. Classical smog occurs in places of
(a) excess SO2
(b) low temperature
(c) high temperature
(d) excess NH3
Answer
B
Question. Photochemical smog formed in congested metropolitan cities mainly consists of
(a) ozone, peroxyacetyl nitrate and NOx
(b) smoke, peroxyacetyl nitrate and SO2
(c) hydrocarbons, SO2 and CO2
(d) hydrocarbons, ozone and SOx
Answer
A
Question. In almost all Indian metropolitan cities like Delhi, the major atmospheric pollutant(s) is/are
(a) suspended particulate matter (SPM)
(b) oxides of sulphur
(c) carbon dioxide and carbon monoxide
(d) oxides of nitrogen
Answer
A
Question. The non-viable particulate among the following is
(a) Dust
(b) Bacteria
(c) Moulds
(d) Fungi
Answer
A
Question. Photochemical smog occurs in warm, dry and sunny climate. One of the following is not amongst the components of photochemical smog, identify it.
(a) NO2
(b) O3
(c) SO2
(d) Unsaturated hydrocarbon
Answer
C
Question. The smog is essentially caused by the presence of
(a) Oxides of sulphur and nitrogen
(b) O2 and N2
(c) O2 and O3
(d) O3 and N2
Answer
A
Question. Air pollution causing photochemical oxidants production include
(a) Carbon monoxide, sulphur dioxide
(b) Nitrous oxide, nitric acid fumes, nitric oxide
(c) Ozone, peroxyacetyl nitrate, aldehydes
(d) Oxygen, chlorine, fuming nitric acid
Answer
C
Question. The pollutants which came directly in the air from sourcesare called primary pollutants. Primary pollutants are sometimes converted into secondary pollutants. Which of the ollowing belongs to secondary air pollutants?
(a) C O
(b) Hydrocarbon
(c) Peroxyacetyl nitrate
Answer
C
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 agent
(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.
Answer
B
