In This Post we are providing Chapter-7 ENVIRONMENTAL CHEMISTRY NCERT MOST IMPORTANT QUESTIONS for Class 11 CHEMISTRY which will be beneficial for students. These solutions are updated according to 2021-22 syllabus. These MCQS can be really helpful in the preparation of Board exams and will provide you with a brief knowledge of the chapter.
NCERT MOST IMPORTANT QUESTIONS ON ENVIRONMENTAL CHEMISTRY
1.What is troposphere?
Ans:The lowest region atmosphere in which the human beings along with other organisms live is called troposphere. It extends upto the height of
2.Name some gaseous air pollutants.
Ans:Gaseous air pollutants are oxides of sulphur, nitrogen and carbon, hydrogen sulphide, hydrocarbons, ozone and other oxidants.
3.What are the diseases caused by sulphur dioxide?
Ans:Sulphur dioxide causes respiratory diseases eg. asthma, bronchitis, emphysema in human beings, sulphur dioxide causes irritation to the eyes, resulting in tears and redness.
4.List gases which are responsible for green house effect?
Ans:Carbon dioxide, methane, water vapors, nitrous oxide, CFC’s and ozone are responsible for green house effect.
5.What is the effect of CFC’s on ozone layer?
Ans: 02Chlorofluorocarbon (CFC’s) damage the ozone layer and creates holes in ozone layer.
6.What is greenhouse effect?
Ans:Atmosphere traps the Sun’s heat near the Earth’s surface and keeps it warm. This is Greenhouse effect.
7.Which disease is caused due to ozone layer depletion?
Ans:Ultraviolet rays reaching the earth passing through the ozone hole cause skin cancer.
8.What is smog?
Ans: When smoke with fog, it is called smog.
9.The London smog is caused in which season and time of the day?
Ans: The London smog is caused during summer season and in the afternoon part of the day when it is very hot.
10.Name two gases which form acid rain.
Ans: 04SO2 and NO2.
11.Which acid is present is the acid rain?
Ans: 05The acids present in the acid rain are
H2SO4, HNO3 and HCl.
12.What is PAN?
Ans: 06PAN is Peroxy acetyl nitrate.
13.When does rain water become acid rain?
Ans: 08When pH of rain water becomes as low as 2 to 3.5. It forms acid rain.
14.What is BOD?
Ans: 01BOD stands for Biochemical Oxygen Demand.
15.Define green chemistry.
Ans: 03The branch of chemistry that emphasizes on the processes and products that reduce or eliminate the use and generation of toxic / hazardous substances is called green chemistry.
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