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In this article we are providing the NCERT solutions for Class 11 Chemistry Chapter 14, Environmental Chemistry. All these solutions are prepared to contain the appropriate concepts. Moreover, our experts have reviewed/revised these solutions to make them error free.
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Main topics discussed in Class 11 Chemistry chapter- Environmental Chemistry are:
Some of the questions and their solutions from NCERT Solutions for Class 11: Environmental Chemistry, are as follows:
Q. Carbon monoxide gas is more dangerous than carbon dioxide gas, why?
Sol. Carbon monoxide gas is more dangerous than carbon dioxide gas because carbon monoxide gas is a poisonous gas which reacts with the haemoglobin of blood to form carboxy-haemoglobin complex, which reduces blood’s capacity to supply oxygen to various organs and tissues in the body. This results into headache, nervousness, cardiovascular disorder, and if inhaled in large amount, can even cause the death.
CO2, on the other hand is not toxic in nature and does not alter the supply of oxygen inside the body. It only proves to be harmful at very high concentrations as it contributes to the global warming.
Q. Define environmental chemistry.
Sol. Environmental chemistry is the study of chemical and biochemical processes occurring in nature. It deals with the chemical interrelations with our surroundings, which include the study of the origin, transport, reactions, effects and fates of various chemical species in the environment.
Q. What do you mean by biochemical oxygen demand (BOD)?
Sol. Biochemical oxygen demand: It is the amount of oxygen required by bacteria to carry out the decomposition of the organic matter present in a certain volume of a sample of water. It gives us an idea of the amount of organic matter present in water. Lesser the BOD in water, the more clean it would be. Clean water would have BOD value of less than 5 ppm, whereas highly polluted water would have a BOD value of 17 ppm or more.
Q. Do you observe any soil pollution in your neighbourhood? What efforts will you make for controlling the soil pollution?
Sol. Yes, we can easily observe the soil pollution in our neighbourhood which is mainly carried out by the industrial wastes and agricultural pollutants like pesticides and fertilisers. It can be controlled by the following methods:
(i) Excessive use of insecticides and pesticides should be avoided.
(ii) Insecticides like DDT are insoluble in water. Due to which, they remain in soil for a long time, contaminating the root crops.
(iii) Use of polythenes should be avoided.
(iv) Non-biodegradable waste should be recycled rather than burying in the soil.
(v) Household waste, biological waste and chemical waste is often incinerated. Incineration greatly reduces the waste volume.
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