These are non-flammable and non-reactive molecules that find usage in air conditioners, refrigerators, plastics, and electronic industries. Particulates like dust, smoke, fume and mist block our nasal passage and are considered harmful for our health. The carcinogenicity and toxicity of hydrocarbons and other substances are a form of knowledge that should be widespread in order to increase awareness of how they are caused and how such chemicals can affect the health of a whole community depending on the carcinogen or toxin involved. ... NCERT Solutions for Class 12 Chemistry. NCERT Solutions for Class 11 Chemistry Chapter 14 Environmental Chemistry is one of the most important study material for Class 11 examination. Carbon monoxide is toxic in nature whereas carbon-dioxide is non- poisonous in nature. Suggest a reason for the fish kill. It also delves into the reaction, origin, effects and transport of the chemical species in our earth. The radicals, on reaction with atomic oxygen, resulting in the production of more chlorine radicals. Toxic metals like Fe, Al and Mn are released into water bodies by industries and factories. Express this in per cent by mass. It also causes respiratory problems in humans. Even if they do not impact the DNA directly, they can indirectly upset the body’s metabolism and heighten the risk of cancer in the future. The poison arrow tree frog secretes a very powerful toxin, which is powerful enough to kill a human simply by touching it. The second reaction shows that there is a dynamic equilibrium between the decomposition and production of ozone molecules. Some are carcinogenic; some may be destroying the ozone CBSE guide notes are the comprehensive notes which covers the latest syllabus of CBSE and NCERT. What are the major causes of water pollution? The production process which uses the existing knowledge that we have on the principles of chemistry to create, develop and implement chemical compounds and products to decrease the amount of hazardous substances in the environment. The solutions of Class 11 chemistry chapter 14 are prepared by subject experts according to the latest CBSE syllabus 2020-21. The nature of groups or substituents attached to the benzene ring is responsible for activation or deactivation of the benzene ring toward further electrophilic substitution and also orientation of the incoming group. All NCERT Solutions for class Class 11 Science Chemistry are prepared by experts and are 100% accurate. Chemical pollutants: Heavy metals like mercury, cadmium and nickel come under this category. These chemicals when present above the allowable limit can result in damage of the central nervous system, kidneys and liver. Firstly, the waste has to be segregated into biodegradable and non-biodegradable wastes. Can natural substances be toxic or carcinogenic? Question 1. All questions and answers from the NCERT Book of Class 11 Science Chemistry Chapter 1 are provided here for you for free. (a) Express in terms of percent by mass. It includes all the topics given in NCERT class 11 Chemistry text book. Explain tropospheric pollution in 100 words. The chlorine free radical which is produced in the third reaction reacts with ozone as shown below: (iv) C˙\dot{C}C˙l(g) + O3(g) →\rightarrow→ ClO˙\dot{O}O˙ (g) + O2(g), And, ClO˙\dot{O}O˙ (g) + O(g) →\rightarrow→  C˙\dot{C}C˙l(g) + O2(g). They are deemed harmful since they lead to skin cancer, cataract, ageing of the skin and also cause sunburns. was last updated on 3rd December 2020 Learn about Carcinogenic Substances and Its Harmful Effects topic of Chemistry in details explained by subject experts on Vedantu.com. Acid rain damages buildings and structures made of metal and stone. NCERT Chemistry : Some Basic Concepts of Chemistry. Explain. Chemistry Class 11 NCERT Solutions: Chapter 14 Environmental Chemistry Part 1. HOCl and Molecular chlorine get photolysed to provide chlorine-free radicals. Example: […] What are the reactions involved for ozone layer depletion in the stratosphere? How will it help decrease environmental pollution? Instead of using fertilizers, manure and compost can be used effectively, so that these fertilizers don’t get into water bodies and pollute them. Ans: While it is often thought that man-made substances and chemicals are what cause cancer, many carcinogens and toxins exist in nature as well. In this chapter, many important concepts related to the environment are taught to students like atmospheric pollution, water pollution, soil pollution, and reasons for soil pollution. 3. The level of contamination was 15 ppm (by mass): (i) Express this in per cent by mass. Your email address will not be published. What do you mean by ozone hole? We refer to such substances as carcinogenic substances. Carbon dioxide is harmful only at very high concentrations. Pests that need to be killed are plant pathogens, weeds, insects, mollusks etc., which affect the plants and lead to their death. Certain fungi and viruses are known to infect the body and cause cancer as infection proceeds. The level of contamination was 15 ppm (by mass). How? Non-biodegradable wastes should not be dropped into the compost pit so as not interfere in the decomposition of the wastes. Photochemical smog is oxidizing in nature since it is composed of NO. There are two types of smog: Write down the reactions involved during the formation of photochemical smog. (i) Express this in percent by mass. *According to the Revised CBSE Syllabus 2020-21, this chapter has been removed. Formaldehyde, nitric oxide, ozone, PAN, acrolein are the main components of photochemical smog. Photochemical smog is formed due to the reaction of sunlight with nitrogen oxides and hydrocarbons. However, this does not detract from their carcinogenic nature as they will still increase the chances of contracting cancer. They burn to form oxides of carbon. NCERT Solutions for class-11 Chemistry Chapter-14 Environmental Chemistry is prepared by our senior and renowned teachers of entrancei primary focus while solving these questions of class-11 in NCERT textbook, also do read theory of this Chapter-14 Environmental Chemistry while going before solving the NCERT questions. Here on AglaSem Schools, you can access to NCERT Book Solutions in free pdf for Chemistry for Class 11 so that you can refer them as and when required. 1. NCERT Solutions for Class 11 Chemistry Chapter 1 Some basic Concepts of Chemistry. 2. A little increase over the above concentration can even be fatal. NCERT Solutions for Class 11 Chemistry Chapter 1 Some basic Concepts of Chemistry are part of Class 11 Chemistry NCERT Solutions. CBSE NCERT Class XI (11th) | Chemistry. Instead, they should be sent for recycling. If left unchecked, some toxins can lead to irreparable damage and death. 2. The major sources of water pollutants are as given below: excreta and waste, decaying animals and plants. Q1 : ... supposed to be carcinogenic in nature. The level of contamination was 15 ppm (by mass). The moisture content of the soil decreases with an increase in exposure to UV radiations. The topics included in the CBSE class 11 Chemistry syllabus are the basics of the topics to be taught in Class 12. Pro Lite, CBSE Previous Year Question Paper for Class 10, CBSE Previous Year Question Paper for Class 12. Hydrocarbons are compounds that contain carbon and hydrogen in them. *According to the Revised CBSE Syllabus 2020-21, this chapter has been removed. How is classical smog different from photochemical smogs? Students who are preparing for their Class 11 exams must go through NCERT Solutions for Class 11 Chemistry Chapter 1 Some Basic Concepts of Chemistry. For example: Ethane CH3—CH3 • Unsaturated Hydrocarbon • Aromatic Hydrocarbon Benzene and its derivatives are called aromatic compounds. 15 ppm (by mass) was the level of contamination. The steps involved in the formation of photochemical smog are: Hydrocarbons and nitrogen dioxide are released into the atmosphere as a result of the burning of fossil fuels. Plants such as Pyrus, Pinus, Quercus, Juniparur, and Vitis can planted as these have the capability to metabolize NO2. The major pollutants include oxides of nitrogen, sulphur, carbon and hydrocarbons. Discuss. For your agricultural field or garden you have developed a compost producing pit. Bacteria like Escherichia coli and Streptococcus faecalis which are found in human excreta are known vectors of gastrointestinal diseases. Certain fungi and viruses are known vectors of gastrointestinal diseases infection proceeds since they to. Ageing of the topics included in the decomposition and production of more chlorine radicals be... 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