{"id":2118,"date":"2021-12-23T17:05:19","date_gmt":"2021-12-23T11:35:19","guid":{"rendered":"https:\/\/infinitylearn.com\/surge\/?p=2118"},"modified":"2025-05-16T14:39:34","modified_gmt":"2025-05-16T09:09:34","slug":"study-materials-ncert-solutions-class-8-science-chapter-18-pollution-of-air-and-water","status":"publish","type":"post","link":"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/science\/chapter-18-pollution-of-air-and-water\/","title":{"rendered":"NCERT Solutions for Class 8 Science Chapter 18 Pollution Of Air And Water"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_37 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" style=\"display: none;\"><label for=\"item\" aria-label=\"Table of Content\"><span style=\"display: flex;align-items: center;width: 35px;height: 30px;justify-content: center;\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/label><input type=\"checkbox\" id=\"item\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' style='display:block'><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/science\/chapter-18-pollution-of-air-and-water\/#Class_8_Science_Chapter_18_NCERT_Solutions_-_Free_PDF_Download\" title=\"Class 8 Science Chapter 18 NCERT Solutions &#8211; Free PDF Download \">Class 8 Science Chapter 18 NCERT Solutions &#8211; Free PDF Download <\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/science\/chapter-18-pollution-of-air-and-water\/#CHAPTER_18_POLLUTION_OF_AIR_AND_WATER_NCERT_SOLUTION\" title=\"CHAPTER 18_POLLUTION OF AIR AND WATER  NCERT SOLUTION\">CHAPTER 18_POLLUTION OF AIR AND WATER  NCERT SOLUTION<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/science\/chapter-18-pollution-of-air-and-water\/#NCERT_Solutions_for_Class_8_Science_Chapter_18_-_Air_and_Water_Pollution\" title=\"NCERT Solutions for Class 8 Science Chapter 18 &#8211; Air and Water Pollution \">NCERT Solutions for Class 8 Science Chapter 18 &#8211; Air and Water Pollution <\/a><ul class='ez-toc-list-level-4'><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-8\/science\/chapter-18-pollution-of-air-and-water\/#In_the_following_chapter_we_will_go_over_all_of_the_exercises_-_11_Questions_and_Answers_in_Chapter_18\" title=\"In the following chapter, we will go over all of the exercises: &#8211; 11 Questions and Answers in Chapter 18 \">In the following chapter, we will go over all of the exercises: &#8211; 11 Questions and Answers in Chapter 18 <\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<p>The industrialization and population growth have led to the increased emission of pollutants in the environment. These pollutants are in the form of smoke, dust, chemicals, etc. which pollute the air and water. As a result, the quality of air and water gets deteriorated.<\/p>\n<p>NCERT Solutions for Class 8 Science Chapter 18 pollution of air and water &#8211; In this chapter, students will study about the meaning of pollution and how it occurs. They will also study about the types and effects of air pollution and water pollution. They will learn about the measures that should be taken to control pollution.<\/p>\n<h2><span style=\"font-size: 14pt;\"><b>Class 8 Science Chapter 18 NCERT Solutions &#8211; Free PDF Download<\/b> <\/span><\/h2>\n<p><b><span data-contrast=\"auto\">NCERT Solutions for Class 8 Science<\/span><\/b><span data-contrast=\"auto\"> (Chemistry) Chapter 18 &#8211; Pollution of Air and Water solved by Expert Teachers as per NCERT (CBSE) Book guidelines are available for free PDF download at infinitylearn.com, India&#8217;s No. 1 online tutoring website. All Exercise Questions with Solutions for Chapter 18 &#8211; Pollution of Air and Water to help you revise the entire syllabus and get more marks. Join us for a free webinar with India&#8217;s greatest Class 8 Science tutor.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\"> <\/span><\/p>\n<p><span data-contrast=\"auto\">Infinity Learn is a website that offers students free <\/span><a href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/\" target=\"_blank\" rel=\"noopener\"><span style=\"color: #0000ff;\">NCERT solutions<\/span><\/a><span data-contrast=\"auto\"> and other study tools. 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href=\"\/surge\/?pdfemb-serveurl=https%3A%2F%2Finfinitylearn.com%2Fsurge%2Fwp-content%2Fuploads%2Fsecurepdfs%2F2022%2F05%2FPOLLUTION-OF-AIR-AND-WATER.pdf\" class=\"pdfemb-viewer\" style=\"\" data-width=\"max\" data-height=\"max\" data-mobile-width=\"0\"  data-scrollbar=\"both\" data-download=\"off\" data-tracking=\"on\" data-newwindow=\"on\" data-pagetextbox=\"off\" data-scrolltotop=\"on\" data-startzoom=\"100\" data-startfpzoom=\"100\" data-download-nonce=\"db917fc37e\" data-disablerightclick=\"on\" data-toolbar=\"top\" data-toolbar-fixed=\"on\">POLLUTION OF AIR AND WATER<br\/><\/a>\n<h2><span style=\"font-size: 14pt;\"><strong>CHAPTER 18_POLLUTION OF AIR AND WATER  NCERT SOLUTION<\/strong><\/span><\/h2>\n<p><span style=\"color: #0000ff;\"><strong>Question. What are the different ways in which water gets contaminated?<\/strong><\/span><\/p>\n<p><strong>A. Water gets contaminated due to :<\/strong><\/p>\n<ol style=\"list-style-type: lower-roman;\">\n<li>excessive use of pesticides and insecticides.<\/li>\n<li>Discharge of industrial effluents into rivers, lakes, etc.<\/li>\n<li>She was throwing garbage into water bodies.<\/li>\n<li>Leakage of oil into the sea due to damage of ships that transports oil in the large<\/li>\n<li>discharge of effluents into water bodies from slaughterhouses, poultry, dairy farms, etc.<\/li>\n<\/ol>\n<p><strong><span style=\"color: #0000ff;\">Question.<\/span> <span style=\"color: #0000ff;\">At an individual level, how can you help reduce air pollution?<\/span><\/strong><\/p>\n<p><strong>A. An individual can reduce air pollution by :<\/strong><\/p>\n<ol style=\"list-style-type: lower-roman;\">\n<li>avoiding using cars as much as possible and using public transport whenever possible.<\/li>\n<li>By not using vehicles for short distances.<\/li>\n<li>I use clean fuels such as LPG and CNG instead of diesel and petrol.<\/li>\n<li>Always dispose of the garbage correctly and not burn it.<\/li>\n<li>They are controlling the emissions from vehicles and household chimneys.<\/li>\n<\/ol>\n<p><strong><span style=\"color: #0000ff;\">Question.<\/span> <span style=\"color: #0000ff;\">Clear, transparent water is always fit for drinking. Comment.<\/span><\/strong><\/p>\n<p>A. i) No, Clear and transparent water is not always fit for drinking.<\/p>\n<p>ii) Water might appear clean, but it may contain some disease-causing microorganisms and other dissolved impurities.<\/p>\n<p>iii) Hence, it is advised to purify water before drinking.<\/p>\n<p>iv) Purification can be done by water purifying systems or boiling the water.<\/p>\n<p><strong><span style=\"color: #0000ff;\">Question.<\/span> <span style=\"color: #0000ff;\">You are a member of the municipal body of your town. <\/span><\/strong><span style=\"color: #0000ff;\"><strong>Please make a list of measures to help your town ensure a clean water supply to all its residents.<\/strong><\/span><\/p>\n<p><strong>A. To ensure the supply of clean water to all residents, the following steps must be taken :<\/strong><\/p>\n<ol style=\"list-style-type: lower-roman;\">\n<li>The main water source must be appropriately maintained with built-in clean surroundings.<\/li>\n<li>Chemical methods such as chlorination must be used to purify water.<\/li>\n<li>The area around water pipes must also be clean.<\/li>\n<\/ol>\n<p><strong><span style=\"color: #0000ff;\">Question.<\/span> <span style=\"color: #0000ff;\">Explain the differences between pure air and polluted air.<\/span><\/strong><\/p>\n<p><strong>A.<\/strong><\/p>\n<table>\n<tbody>\n<tr>\n<td width=\"293\"><strong>PURE AIR<\/strong><\/td>\n<td width=\"293\"><strong>POLLUTED AIR<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"293\">i)      Contains no pollutants.<\/td>\n<td width=\"293\">i)      Contains pollutants.<\/td>\n<\/tr>\n<tr>\n<td width=\"293\">ii)     Contains large amounts of oxygen.<\/td>\n<td width=\"293\">ii)     Contains small amounts of oxygen.<\/td>\n<\/tr>\n<tr>\n<td width=\"293\">iii)    It is safe to breathe.<\/td>\n<td width=\"293\">iii)    It is not safe to breathe.<\/td>\n<\/tr>\n<tr>\n<td width=\"293\">iv)    It does not cause any diseases.<\/td>\n<td width=\"293\">iv)    It may result in various diseases (especially respiratory).<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong><span style=\"color: #0000ff;\">Question.<\/span> <span style=\"color: #0000ff;\">Explain circumstances leading to acid rain. How does acid rain affect us?<\/span><\/strong><\/p>\n<p><strong>A.<\/strong> i) Burning fossil fuels such as coal and diesel releases pollutants such as sulphur dioxide and nitrogen dioxide into the atmosphere.<\/p>\n<p>ii) These pollutants react with water vapours in the atmosphere to form sulphuric acid and nitric acid.<\/p>\n<p>iii)     These acids come down with the rain, resulting in acid rain.<\/p>\n<p><strong>          Effects of acid rain : <\/strong><\/p>\n<p>i) Acid rains damage crops.<\/p>\n<p>ii) Acid rains corrode buildings and structures, especially marble ones like the Taj Mahal.<\/p>\n<p><strong><span style=\"color: #0000ff;\">Question.<\/span> <span style=\"color: #0000ff;\">Which of the following is not a greenhouse gas?<\/span><\/strong><\/p>\n<ol style=\"list-style-type: lower-alpha;\">\n<li><strong>Carbon dioxide<\/strong><\/li>\n<li><strong>Sulphur dioxide<\/strong><\/li>\n<li><strong>Methane<\/strong><\/li>\n<li><strong>Nitrogen<\/strong><\/li>\n<\/ol>\n<p><strong>A.<\/strong> d) Nitrogen<\/p>\n<p><strong><span style=\"color: #0000ff;\">Question. Describe the &#8216;Greenhouse Effect&#8217; in your own words.<\/span><\/strong><\/p>\n<p><strong>A.<\/strong><\/p>\n<ol style=\"list-style-type: lower-roman;\">\n<li>The greenhouse effect is caused by greenhouse gases such as carbon dioxide, methane, and water vapour.<\/li>\n<li>When solar radiations reach the earth, some of these radiations are absorbed by the earth and then released back into the atmosphere.<\/li>\n<li>Greenhouse gases in the atmosphere trap these radiations and do not allow heat to escape. This helps keep our planet warm and, thus, helps in human survival.<\/li>\n<li>However, an indiscriminate increase in the number of greenhouse gases can lead to an excessive increase in the earth&#8217;s temperature leading to global warming.<\/li>\n<\/ol>\n<p><strong><span style=\"color: #0000ff;\">Question.<\/span> <span style=\"color: #0000ff;\">Describe the threat to the beauty of the Taj Mahal.<\/span><\/strong><\/p>\n<p><strong>A.<\/strong><\/p>\n<ol style=\"list-style-type: lower-roman;\">\n<li>Acid rain is a major threat to the beauty of the Taj Mahal.<\/li>\n<li>Acid rain corrodes the marbles of this monument. This phenomenon is known as marble cancer.<\/li>\n<li>Also, the soot particles emitted from the Mathura oil refinery near Agra lead to the yellowing of the marble.<\/li>\n<\/ol>\n<p><strong><span style=\"color: #0000ff;\">Question.<\/span> <span style=\"color: #0000ff;\">Why does the increased level of nutrients in the water affect the survival of aquatic organisms?<\/span><\/strong><\/p>\n<p><strong>A.<\/strong><\/p>\n<ol style=\"list-style-type: lower-roman;\">\n<li>An increase in the level of nutrients in a water body leads to an excessive increase in the algae population in the water body.<\/li>\n<li>When these algae die, they serve as food for decomposers, like bacteria.<\/li>\n<li>A lot of oxygen is utilized in this process.<\/li>\n<li>This decreases the level of oxygen dissolved in the water body, which may kill aquatic organisms.<\/li>\n<\/ol>\n<h3><b><span data-contrast=\"auto\">NCERT Solutions for Class 8 Science Chapter 18 &#8211; Air and Water Pollution<\/span><\/b><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\"> <\/span><\/h3>\n<p><span data-contrast=\"auto\">The NCERT Grade 8 Science Chapter 18, Pollution of Air and Water, addresses a serious issue and its consequences. The chapter also discusses how to handle the dangerous phenomena of pollution and how individuals might contribute to its decrease. What Causes Air Pollution? How Does Air Become Polluted? What Can Be Done in the Case of the Taj Mahal and the Greenhouse Effect? What Causes Water Pollution and How Does Water Become Polluted? What exactly is potable water, and how is it purified? Some of the important themes explored in this chapter include What Can Be Done? and What Can Be Done?<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\"> <\/span><\/p>\n<p><span data-contrast=\"auto\">Examples and visual representations aid in a better understanding of air and water pollution effects. Students&#8217; learning experiences will motivate them to take action in the fight against pollution. Students benefit from activities and project work since they are eye-opening. Case studies assist students in comprehending the current situation as a result of unchecked levels of air and water pollution. Technical vocabulary learned throughout the chapter, summaries of key themes, and tasks at the end aid with skimming the chapter and self-evaluation. This chapter will introduce pupils to the perils of pollution. It will assist students in gaining a better understanding of the subject and mastering the principles that will enable them to perform better.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\"> <\/span><\/p>\n<p><span data-contrast=\"auto\">NCERT Solutions for Class 8 Science Chapter 18 (Pollution of Air and Water) explained by qualified Science instructors are 100% accurate. As per CBSE Board requirements, we provide answers to the Class 8 Science textbook questions using the most recent NCERT book for Class 8 Science. <\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\"> <\/span><\/p>\n<p><b><span data-contrast=\"auto\">The following are the subjects and sub-topics in Chapter 18: Pollution of Air and Water.<\/span><\/b><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\"> <\/span><\/p>\n<ol>\n<li><span data-contrast=\"auto\">Ex 18.1 &#8211; Pollution of the Air<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\"> <\/span><\/li>\n<li><span data-contrast=\"auto\">Ex 18.2 &#8211; What Causes Air Pollution?<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\"> <\/span><\/li>\n<li><span data-contrast=\"auto\">Exhibit 18.3 &#8211; The Taj Mahal as a Case Study<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\"> <\/span><\/li>\n<li><span data-contrast=\"auto\">Explanation of Experiment 18.4 &#8211; Greenhouse Effect<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\"> <\/span><\/li>\n<li><span data-contrast=\"auto\">What Can Be Done in Exhibit 18.5?<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\"> <\/span><\/li>\n<li><span data-contrast=\"auto\">Ex 18.6 &#8211; Pollution of Water<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\"> <\/span><\/li>\n<li><span data-contrast=\"auto\">Ex 18.7 &#8211; What Causes Water Pollution?<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\"> <\/span><\/li>\n<li><span data-contrast=\"auto\">Ex 18.8: What is potable water, and how is it purified?<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\"> <\/span><\/li>\n<li><span data-contrast=\"auto\">Ex 18.9 &#8211; Is There Anything That Can Be Done?<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\"> <\/span><\/li>\n<\/ol>\n<h4><span style=\"font-size: 12pt;\"><b>In the following chapter, we will go over all of the exercises: &#8211; 11 Questions and Answers in Chapter 18<\/b> <\/span><\/h4>\n<p><span data-contrast=\"auto\">In addition to the tasks, you should practice all of the solved cases in the book to solidify your understanding of air and water pollution. Chapter 18: Pollution of Air and Water is available as a free PDF download. Take a printout and keep it with you as you study for your exams.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\"> <\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The industrialization and population growth have led to the increased emission of pollutants in the environment. 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