Ncert Solutions Chemistry Class 11th
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14.22 Assertion: CO is a colourless and odourless gas, highly poisonous to living beings.
Reason: It is produced as a result of incomplete combustion of carbon and is mainly released into the air by automobile exhaust.
14.22 Assertion: CO is a colourless and odourless gas, highly poisonous to living beings.
Reason: It is produced as a result of incomplete combustion of carbon and is mainly released into the air by automobile exhaust.
(b) CO is highly poisonous to living beings because of its ability to block the delivery of oxygen to the organs and tissues.
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<p><strong>Assertion and Reason:</strong></p>
<p><strong>Directions:</strong></p>
<p>(a) Assertion and reason both are correct statements and reason is correct explanation for assertion.</p>
<p>(b) Assertion and reason both are correct statements but reason is not correct explanation for assertion.</p>
<p>(c) Assertion is correct statement but reason is wrong statement.</p>
<p>(d) Assertion is wrong statement but reason is correct statement.</p>
<p><strong>14.21 Assertion: Atmosphere trapping the sun’s heat near the earth’s surface is called natural greenhouse effect. </strong></p>
<p><strong>Reason: Atmosphere trapping the sun’s heat maintains the temperature and makes the earth perfect for life.</strong></p>
14.20. 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.
14.20. 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.
The compost producing pit should be kept covered so that flies cannot make entry into it and bad odour is minimized.
The waste materials which are non-biodegradable like glasses, plastic bags, plastic bottles, polybags, must be handed over to the vendors who can send them to the recycling plants.
Upvote Domestic waste can be separated into biodegradable and non-biodegradable materials. Non-biodegradable materials such as plastic, glass, metal scraps etc. are sent for recycling. Biodegradable wastes can be deposited in landfills and are converted into compost to be used as manure.
Upvote 14.18. 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.
14.18. 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.
Excessive phytoplankton (organic pollutants such as leaves, grass trash etc.) present in water are biodegradable. Bacteria decompose these organic matters in water. During this process, when a large number of bacteria decompose these organic matters, they consume the dissolved oxygen in water. When
Upvote 14.17. What would have happened if the greenhouse gases were totally missing in the Earth’s atmosphere? Discuss.
14.17. What would have happened if the greenhouse gases were totally missing in the Earth’s atmosphere? Discuss.
The solar energy radiated back from the Earth's surface is absorbed by the greenhouse gases (CO2, CH4, O3, CFCs) present near the Earth's surface.
They heat up the atmosphere near the Earth's surface and keep it warm. As a result of these, there is the growth of vegetation which supports life. In the
Upvote 14.16. What do you mean by green chemistry? How will it help in decrease environmental pollution?
14.16. What do you mean by green chemistry? How will it help in decrease environmental pollution?
Green chemistry is a way of thinking and is about utilising the existing knowledge and principles of chemistry and other sciences to reduce the adverse effect of pollution. It is a production process that would bring about minimum pollution or deterioration to the environment. In a nutshell, it is a
Upvote 14.15. What are pesticides and herbicides? Explain giving examples.
14.15. What are pesticides and herbicides? Explain giving examples.
Pesticides are the chemical compounds used to control the damage caused by pests (insects, rodents etc.)
Example: Aldrin, Dieldrin, B.H.C etc.
Herbicides are the chemicals used to control weeds.
Example: Triazines, Sodium chlorate (NaClO3), sodium arsenite (Na3AsO3).
Upvote 14.14. Do you observe any soil pollution in your neighbourhood? What efforts will you make for controlling the soil pollution?
14.14. Do you observe any soil pollution in your neighbourhood? What efforts will you make for controlling the soil pollution?
The major sources of soil pollution are industrial wastes and agricultural pollutants like fertilizers and pesticides. Insecticides like DDT are insoluble in water and are absorbed by plant roots. Many pesticides like Aldrin and Dieldrin are toxic and non-biodegradable, which can enter the higher tr
Upvote 14.13. What do you mean by Biochemical Oxygen Demand (BOD)?
14.13. What do you mean by Biochemical Oxygen Demand (BOD)?
The amount of oxygen required by bacteria to breakdown the organic matter present in a certain volume of a sample of water is called Biochemical Oxygen Demand (BOD).
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