NCERT Solutions for Class 11 Chemistry Chemistry Part-2 Chapter 14

Environmental Chemistry Class 11

Chapter 14 Environmental Chemistry Exercise Solutions

<< Previous Chapter 13 : Hydrocarbons

Exercise : Solutions of Questions on Page Number : 413

Q1 :  

Define environmental chemistry.


Answer :

Environmental chemistry is the study of chemical and biochemical processes occurring in nature. It deals with the study of origin, transport, reaction, effects, and fates of various chemical species in the environment.

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Q2 :  

Explain tropospheric pollution in 100 words.


Answer :

Tropospheric pollution arises due to the presence of undesirable substances in the lowest layer of the atmosphere.

Oxides of sulphur, nitrogen, carbon, and hydrocarbons are the major gaseous pollutants.

Oxides of sulphur (SO2and SO3) and nitrogen (NO2, NO) are produced as a result of burning of fossil fuels (coal, automobile fuel). These oxides react with water in the presence of atmospheric oxygen to form nitric acid (HNO3) and sulphuric acid (H2SO4), which leads to the formation of 'Acid rain'.

Acid rain causes harm to agriculture, plants, and trees. It also leads to various respiratory ailments.

Hydrocarbons are carbon and hydrogen containing compounds that burn to produce oxides of carbon. Hydrocarbons are carcinogenic and their products are also major pollutants. Carbon monoxide (CO) is poisonous in nature as it reacts with the haemoglobin of blood, which can even result in death. Though carbon dioxide (CO2) is not toxic in nature, yet it contributes towards global warming by trapping the reflected IR rays. This results in the heating up of the Earth's atmosphere, thereby leading to the melting of icebergs and glaciers.

Particulates of smoke, dust, mist, and fume are harmful for human health as they are likely to block the nasal passage of a person, causing respiratory ailments. Smoke and fog combine to produce smog during a cool, humid day, thereby reducing visibility to a large extent. Photochemical smog is formed due to the presence of PAN, ozone, formaldehyde, and acrolein. It causes eye irritation, headaches, and chest pain. It also leads to the cracking of rubber and does damage to plants.

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Q3 :  

Carbon monoxide gas is more dangerous than carbon dioxide gas. Why?


Answer :

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Q4 :  

List gases which are responsible for greenhouse effect.


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Q5 :  

Statues and monuments in India are affected by acid rain. How?


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Q6 :  

What is smog? How is classical smog different from photochemical smog?


Answer :

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Q7 :  

Write down the reactions involved during the formation of photochemical smog.


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Q8 :  

What are the harmful effects of photochemical smog and how can they be controlled?


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Q9 :  

What are the reactions involved for ozone layer depletion in the stratosphere?


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Q10 :  

What do you mean by ozone hole? What are its consequences?


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Q11 :  

What are the major causes of water pollution? Explain.


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Q12 :  

Have you ever observed any water pollution in your area? What measures would you suggest to control it?


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Q13 :  

What do you mean by Biochemical Oxygen Demand (BOD)?


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Q14 :  

Do you observe any soil pollution in your neighbourhood? What efforts will you make for controlling the soil pollution?


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Q15 :  

What are pesticides and herbicides? Explain giving examples.


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Q16 :  

What do you mean by green chemistry? How will it help decrease environmental pollution?


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Q17 :  

What would have happened if the greenhouse gases were totally missing in the earth's atmosphere? Discuss.


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Q18 :  

A large number of fish are suddenly found floating dead on a lake. There is no evidence of toxic dumping but you find an abundance of phytoplankton. Suggest a reason for the fish kill.


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Q19 :  

How can domestic waste be used as manure?


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Q20 :  

For your agricultural field or garden you have developed a compost producing pit. Discuss the process in the light of bad odour, flies and recycling of wastes for a good produce.


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<< Previous Chapter 13 : Hydrocarbons

Chemistry Part-2 - Chemistry : CBSE NCERT Exercise Solutions for Class 11th for Environmental Chemistry will be available online in PDF book form soon. The solutions are absolutely Free. Soon you will be able to download the solutions.

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