There will be total 10 MCQ in this test. The level of contamination was 15 ppm (by mass) (i) Express this in percent by mass ... Q.21 The following data are obtained when dinitrogen and dioxygen react together to form different compounds: Given that carcinogens aren’t necessarily toxic upon first exposure, they are far more dangerous as any cancer they cause can go unnoticed long enough for it to develop into a serious problem. When insecticides like DDT are used, they get stuck in the soil for a longer time since they are not soluble in water and thus contaminating the crops and soil. The hepatitis virus can cause cancer when it infects its host, many vegetable alkaloids can be extracted from natural sources which will cause paralysis, and even death should human beings come in contact with them. Photochemical smog is formed as a result of the presence of ozone, PAN, acrolein and formaldehyde. The carcinogenicity and toxicity of hydrocarbons are very carefully monitored phenomena given the harm they can cause to a community at large. Carcinogenic Substances- Substances involved in the formation of cancer. The liver’s defenses can be overpowered or quelled by certain powerful toxins or toxic chemicals like mercury and chlorine (which exists in gaseous form). Express this in per cent by mass. The topics included in the CBSE class 11 Chemistry syllabus are the basics of the topics to be taught in Class 12. They burn to form oxides of carbon. 2. The moisture content of the soil decreases with an increase in exposure to UV radiations. They harm plants by causing ageing, breakdown of tissues and shedding of leaves, flowers and twigs. Excess exposure to these rays may, in some cases, also lead to mutation in plants. Some are carcinogenic; some may be destroying the ozone Arinjay Jain Academy. 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. Chemistry Class 11 NCERT Solutions: Chapter 14 Environmental Chemistry Part 1. Do you observe any soil pollution in your neighbourhood? Environmental Chemistry is one of the most important chapters in the NCERT class 11 chemistry book. Thus, soil pollution can be controlled by controlling the addition of pesticides and fertilizers and instead use manures and compost. NCERT textbooks are the best study materials for the students of Class 11, studying from the NCERT textbooks will help you to understand the chapters in a better way. Due to high concentrations of these pollutants, they react with sunlight. Carbon monoxide gas is more dangerous than carbon dioxide gas. 5 g of Mn02will react with: 146 g = 87 9 ... CHC13, chloroform, which is carcinogenic. Carbon monoxide is deemed toxic since it forms a complex with. Some Basic Concept of chemistry : NCERT Solutions - Class 11 Chemistry ... CHCl 3, supposed to be carcinogenic in nature. The major gases that cause greenhouse effect are: Statues and monuments in India are affected by acid rain. Most carcinogenic substances also tend to be toxic but bearable in small quantities. This regeneration of chlorine-free radicals results in a continuous breakdown of ozone in the stratosphere, thus almost permanently damaging the ozone layer. Use of catalytic converters can be used to prevent the release of NO2 into the atmosphere. Explain tropospheric pollution in 100 words. ... compounds. 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. The level of contamination was 15 ppm (by mass): (i) Express this in per cent by mass. Green chemistry aims to make sure that the end products yield is 100% so that there are no harmful substances released into the environment. The law states that if two elements combine to form more than one compound, then the masses of one element that combines with the fixed mass of another element are in the ratio of small whole numbers. When this layer gets depleted, a greater amount of radiations will enter the earth’s atmosphere. The presence of unwanted substances in the troposphere’s lowest layer cause tropospheric pollution. Substances like chlorine, petroleum, mercury, arsenic, and more are some examples of highly toxic substances that the human body cannot handle. Ans: The body is actually attacked by toxins more than expected. 15 ppm (by mass) was the level of contamination. The decomposed matter called Humus can be used as manure. (ii) Determine the molality of chloroform in the water sample. Learn about Carcinogenic Substances and Its Harmful Effects topic of Chemistry in details explained by subject experts on Vedantu.com. What are the reactions involved for ozone layer depletion in the stratosphere? 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. Carcinogenicity and toxicity are not traditionally the same, although one can lead to the other. [FREE] EBOOK Some N-Nitroso Compounds (IARC Monographs on the Evaluation of the Carcinogenic Risks. For example, we now use H2O2 instead of tetrachloroethane and chlorine gas in the process of bleaching and drying of paper. The rest of the wastes, which are non-biodegradable have to be recycled. Toxicity can be stated as the degree to which a chemical can cause damage to the human body. Their discharges should be frequently checked for traces of these metals and then released into water bodies. This phenomenon is known as the ‘ozone hole’. HOCl and Molecular chlorine get photolysed to provide chlorine-free radicals. There are two types of smog: Write down the reactions involved during the formation of photochemical smog. What are pesticides and herbicides? Toxic metals like Fe, Al and Mn are released into water bodies by industries and factories. Examples include sodium arsenite (Na3AsO3), sodium chlorate (NAClO3). *According to the Revised CBSE Syllabus 2020-21, this chapter has been removed. An excess amount of organic matter in water bodies suck up the dissolved oxygen in water thus inhibiting aquatic life in these water bodies. 3. In the stratosphere, ozone is actually formed by the action of UV rays on Dioxygen molecules(O2). Hydrocarbons Class 11 Notes Chemistry Chapter 13 • Hydrocarbon A compound of carbon and hydrogen is known as hydrocarbon. Suggest a reason for the fish kill. This can result in weak eyesight, headaches, cardiovascular disorders and nervousness. Hydrocarbons are carcinogenic and their products are also major pollutants. A sample of drinking water was found to be severely contaminated with chloroform, CHCl 3, supposed to be carcinogenic in nature. The compost pit should be covered to prevent bad odour and flies. NCERT solutions for Class 11 Chemistry Download as PDF. It also causes respiratory problems in humans. (i)  O2(g)  →UV\overset{UV}{\rightarrow}→UV  O(g) +O(g), (ii)  O2(g) + O(g)  ↔UV\overset{UV}{\leftrightarrow}↔UV  O3(g). Carcinogenicity is the attribute of substances that will indirectly cause the body’s own cellular regeneration system to go into overdrive and cause tumors/other forms of cancer. Discuss the process in the light of bad odour, flies and recycling of wastes for a good product. Class 11 Chemistry chapter wise NCERT solution for Class 11 Chemistry Some Basic Concepts of Chemistry Part 1 and all the chapters can be downloaded from our website and myCBSEguide mobile app for free. They are carcinogenic in nature and are also regarded as major pollutants. Photochemical smog is oxidizing in nature since it is composed of NO. But along with this "best of times," there is a "worst of times" coming from the recognition that many widely used organic compounds are more toxic than previously suspected. Required fields are marked *, International Standards for Drinking Water, Strategies To Control Environmental Pollution. The reactions proceed as shown below: NO2 →hγ\overset{h\gamma }{\rightarrow}→hγ  NO + O, (Nitrogen dioxide)                                                                       (Nitric oxide), O          +          O2   ↔\leftrightarrow↔   O3, O3       +          NO   →\rightarrow→     NO2 + O2. Question 17. You will also love the ad-free experience on Meritnation’s NCERT Solutions. For example: Ethane CH3—CH3 • Unsaturated Hydrocarbon • Aromatic Hydrocarbon Benzene and its derivatives are called aromatic compounds. NCERT Books chapter-wise Solutions (Text & Videos) are accurate, easy-to-understand and most helpful in Homework & Exam Preparations. All questions and answers from the NCERT Book of Class 11 Science Chemistry Chapter 1 are provided here for you for free. This solution has answers to the textbook questions, worksheets, and exemplary questions that help you get tuned in with the topic. While man-made toxins and carcinogens are a real risk to public health and safety, it is possible to find substances with significant carcinogenicity and toxicity in nature as well. Students who want to score good marks in their board exam must regularly practice the solutions for Class 11 chemistry chapter 14 environmental chemistry. Any factor that disturbs this equilibrium may lead to the ozone layer getting depleted due to its decomposition. 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. Smog is caused due to the combination of smoke and fog which reduces the visibility of traffic. Dec 03, 2020 - NCERT Solutions - Basic Concepts of Chemistry (Part - 1) Class 11 Notes | EduRev is made by best teachers of JEE. When dealing with toxicity, the effect is usually based on how the toxin attacks the body and how the body came in contact with it in the first place. Download NCERT Solutions for Class 11 Chemistry (Link of Pdf file is given below at the end of the Questions List) ... supposed to be carcinogenic in nature. What measures would you suggest to control it? The second reaction shows that there is a dynamic equilibrium between the decomposition and production of ozone molecules. If that fails, macrophages will move in to consume the affected cell or other cells will attempt to deny nutrition to the affected cell. Certain fungi and viruses are known to infect the body and cause cancer as infection proceeds. Acid rain when reacting with limestone causes loss of colour and lustre of monuments, resulting in their disfiguration. NCERT Solutions for Class 11 Chemistry Chapter 14 Environmental Chemistry is one of the most important study material for Class 11 examination. The level of contamination was 15 ppm (by mass). Why? List gases which are responsible for greenhouse effect. 2:40. Those that can be degraded by bacteria such as leaves, food wastes are biodegradable and dumped in landfills along with micro-organisms that decompose it. Register free for online tutoring session to clear your doubts. Thus, all the oxygen in the lake is used up and BOD drops below 6 ppm, suffocating the fish. Your email address will not be published. We refer to such substances as carcinogenic substances. Pests that need to be killed are plant pathogens, weeds, insects, mollusks etc., which affect the plants and lead to their death. Download Free solutions of NCERT chemistry Class 11th from SaralStudy. These are non-flammable and non-reactive molecules that find usage in air conditioners, refrigerators, plastics, and electronic industries. Hence, the given experimental data obeys the law of multiple proportions. Class 11 Chemistry notes on Chapter 13 Hydrocarbons class 11 Notes Chemistry are also available for download in CBSE Guide website. Pro Lite, Vedantu Text – Book Questions ... CHC l3, supposed to be carcinogenic in nature. have made organic chemistry an enormously vital discipline. NCERT Solutions for Class 11 Science Chemistry Chapter 1 - Some Basic Concepts Of Chemistry [FREE]. Pathogens: Bacteria and other micro-organisms come under this category. This results in a heating effect upon the earth thus increasing the earth’s temperature. Chapter 1 – Some Basic Concepts of Chemistry. Given the danger of cancer and the danger of imbibing or coming into contact with dangerous substances, it's important to understand the nature of carcinogenicity and toxicity. Q1 : ... supposed to be carcinogenic in nature. NCERT TEXTBOOK QUESTIONS SOLVED. What would have happened if the greenhouse gases were totally missing in the earth’s atmosphere? The masses of dioxygen bear a whole number ratio of 1:2:2:5. Carbon dioxide is harmful only at very high concentrations. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number. NCERT Solutions for Class 11 Chemistry Chapter 14 Environmental Chemistry is one of the most important study material for Class 11 examination. 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. Clean water will have a BOD of below 5 ppm whereas a highly polluted water source will have a BOD of more than 17 ppm. 1.Why are they carcinogenic: From my point of view as a medicinal chemist, polycyclic aromatic hydrocarbons compounds tend to be metabolized by specific cytochrome P450 (CYP 450) isofroms to form highly electrophilic species, which are highly reactive and … Without greenhouse gases, the earth’s average temperature will decline thus making this planet uninhabitable. It also delves into the reaction, origin, effects and transport of the chemical species in our earth. They also prove fatal to phytoplankton, thus resulting in a decline in fish productivity. Understand all the basic concepts of Organic, Inorganic, and Physical Chemistry with detailed … Even with today’s medical advancements, cancer remains to be a very persistent disease that can be incurable in certain circumstances. A tumour is usually formed as a result of cells undergoing accelerated, uncontrolled cell division, which will disrupt normal bodily functions at a cellular level. They are carcinogenic in nature and are also regarded as major pollutants. 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). A mixture of two or more substances that are used to kill pests is called a Pesticide. Organic wastes: They are generally bio-degradable wastes that pollute the water bodies by mixing with them during their runoff phase. (i) Express this in percent by mass. These solutions for Environmental Chemistry are extremely popular among Class 11 Science students for Chemistry Environmental Chemistry Solutions come handy for quickly completing your homework and preparing for exams. They are also called aromatics or arenes. CBSE Ncert Notes for Class 11 Chemistry Hydrocarbons. (iii) CF2Cl2(g) →UV\overset{UV}{\rightarrow}→UV  C˙\dot{C}C˙l(g) + C˙\dot{C}C˙F2Cl(g). Limestone is a major constituent used in various monuments and statues like Taj Mahal in India. (a) Express in terms of percent by mass. NCERT Solutions for Class 11 Chemistry Chapter 1 Some basic Concepts of Chemistry. The fumes from tobacco, petroleum, and coal combustion usually contain polynuclear hydrocarbons. Once it is released into the atmosphere, these CFCs get mixed with atmospheric gases and then, reach the stratosphere, where they get decomposed due to reactions with UV radiations. Know more about carcinogen and it's harmful effects & what causes cancer @CoolGyan The great majority of aromatic compounds in nature, therefore, are produced by plants and micro-organisms, and animals are dependant upon plants for many aromatic compounds either directly or indirectly. Explain. Though carbon dioxide (CO 2) is Chemical pollutants: Heavy metals like mercury, cadmium and nickel come under this category. Photochemical smog is formed due to the reaction of sunlight with nitrogen oxides and hydrocarbons. NCERT Solutions for Class 11 Chemistry Chapter 1 Some basic Concepts of Chemistry are part of Class 11 Chemistry NCERT Solutions. Instead, they should be sent for recycling. The poison arrow tree frog secretes a very powerful toxin, which is powerful enough to kill a human simply by touching it. The greenhouses gases that are present in our atmosphere trap the UV rays coming from Sun and heat up the earth. Stratospheric clouds present in Polar Regions provide a surface for the reaction of hypochlorous acid and chlorine nitrate which on further reaction, gives molecular chlorine. Pro Lite, Vedantu Explain giving examples. (d) Oxides of Carbon How is classical smog different from photochemical smogs? CBSE Guide Hydrocarbons class 11 Notes. NCERT Solutions for Class 11 Chemistry Chapter 1 Some Basic Concepts of Chemistry includes all the important topics with detailed explanation that aims to help students to understand the concepts better. Particulates like dust, smoke, fume and mist block our nasal passage and are considered harmful for our health. Carbon monoxide (CO) reacts with the hemoglobin in our blood and is poisonous in nature and can even be fatal Even though carbon dioxide (CO2)is not toxic by itself, ii Pesticides and fertilizers are the major pollutants that cause soil pollution. Hydrocarbons are compounds that contain carbon and hydrogen in them. The liver is the body’s natural defense against toxins and is typically the first line of defense against poisons and toxins. 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. What is smog? This unchecked growth of cells is what leads to cancer and is usually very difficult to stop in later stages. NCERT solutions for class 11 chemistry chapter 1 Some Basic Concepts of Chemistry - Chapter 1 is one of the important chapters and consists of important concepts that are often asked in class 11 final examination. Question 1. The radicals, on further reaction with atomic oxygen, resulting in the production of more chlorine radicals. Chemistry is the branch which deals with the detailed study of matter, its properties, how and why atoms/substanced combine or separate to form other substances. Toxicity is when the substance causes harm to the body directly and will present with symptoms over time. Can natural substances be toxic or carcinogenic? In this chapter, there are 36 questions in the exercise. How? Firstly, the waste has to be segregated into biodegradable and non-biodegradable wastes. A large number of fish are suddenly found floating dead on a lake. 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. It causes headaches, eye irritation, and chest pain in humans. Instead of using fertilizers, manure and compost can be used effectively, so that these fertilizers don’t get into water bodies and pollute them. The major pollutants include oxides of nitrogen, sulphur, carbon and hydrocarbons. While man-made toxins and carcinogens are a real risk to public health and safety, it is possible to find substances with significant, Dichloromethane Uses and Effects on Environment, Biodegradable and Non-Biodegradable Substances, Vedantu Sorry!, This page is not available for now to bookmark. The NCERT Solutions to the questions after every unit of NCERT textbooks aimed at helping students solving difficult questions.. For a better understanding of this … This document is highly rated … While humans can tolerate the general level of radio waves put out by communication towers across the world, we cannot withstand most other forms of radiation that exist in the known electromagnetic spectrum. Man-made toxins like cyanide and petroleum are also extremely toxic and will cause death if imbibed. The level of contamination was 15 ppm (by mass). 1. Pro Lite, CBSE Previous Year Question Paper for Class 10, CBSE Previous Year Question Paper for Class 12. 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