{"id":3649,"date":"2023-01-02T05:18:48","date_gmt":"2023-01-02T05:18:48","guid":{"rendered":"https:\/\/theexampillar.com\/ncert\/?p=3649"},"modified":"2023-01-31T07:01:32","modified_gmt":"2023-01-31T07:01:32","slug":"ncert-solutions-class-8-science-chapter-6-combustion-and-flame","status":"publish","type":"post","link":"https:\/\/theexampillar.com\/ncert\/ncert-solutions-class-8-science-chapter-6-combustion-and-flame\/","title":{"rendered":"NCERT Solutions Class 8 Science Chapter 6 Combustion and Flame"},"content":{"rendered":"<h2 style=\"text-align: center;\"><span style=\"color: #000000; font-family: georgia, palatino, serif;\">NCERT Solutions Class 8 Science\u00a0<\/span><\/h2>\n<p style=\"text-align: justify;\"><span style=\"color: #000000; font-family: georgia, palatino, serif;\">The NCERT Solutions in English Language for Class 8 Science <strong>Chapter &#8211; 6 (Combustion and Flame) <\/strong>has been provided here to help the students in solving the questions from this exercise.<\/span><\/p>\n<h2 style=\"text-align: center;\"><span style=\"color: #000000; font-family: georgia, palatino, serif;\">Chapter &#8211; 6 (Combustion and Flame)<\/span><\/h2>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>1. List conditions under which combustion can take place.<br \/>\n<\/strong><strong>Answer &#8211;\u00a0 <\/strong>The conditions under which combustion takes place are as follows:<\/span><\/p>\n<ul>\n<li><span style=\"color: #000000;\">Presence of combustible substance.<\/span><\/li>\n<li><span style=\"color: #000000;\">Presence of supporter of combustion &#8211; oxygen.<\/span><\/li>\n<li><span style=\"color: #000000;\">Attainment of ignition temperature.<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>2. Fill in the blanks.<br \/>\n<\/strong><strong>(a)<\/strong> Burning of wood and coal causes __________of air.<br \/>\n<strong>(b)<\/strong> A liquid fuel, used in homes is__________ .<br \/>\n<strong>(c)<\/strong> Fuel must be heated to its ____________ before it starts burning.<br \/>\n<strong>(d)<\/strong> The fire produced by oil cannot be controlled by___________ .<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>Answer &#8211;<br \/>\n<\/strong><strong>(a)<\/strong> Burning of wood and coal causes\u00a0<span style=\"text-decoration: underline;\"><strong>pollution<\/strong><\/span>\u00a0of air.<br \/>\n<strong>(b)<\/strong> A liquid fuel, used in homes is\u00a0<span style=\"text-decoration: underline;\"><strong>kerosene<\/strong><\/span>.<br \/>\n<strong>(c)<\/strong> Fuel must be heated to its\u00a0<span style=\"text-decoration: underline;\"><strong>ignition<\/strong>\u00a0<strong>temperature<\/strong><\/span>\u00a0before it starts burning.<br \/>\n<strong>(d)<\/strong> The fire produced by oil cannot be controlled by\u00a0<strong><span style=\"text-decoration: underline;\">water<\/span>.<\/strong><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>3. Explain how the use of CNG in automobiles has reduced pollution in our cities.<\/strong><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>Answer &#8211;\u00a0 <\/strong>CNG plays an important role in reducing pollution among automobiles for the following reasons:<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li>\n<div class=\" col-md-8\"><span style=\"color: #000000;\">It produces less carbon monoxide gas.<\/span><\/div>\n<\/li>\n<li>\n<div class=\" col-md-8\"><span style=\"color: #000000;\">It produces less carbon dioxide gas.<\/span><\/div>\n<\/li>\n<li>\n<div class=\" col-md-8\"><span style=\"color: #000000;\">It produces less amount of sulphur dioxide and nitrogen dioxide which cause acid rain.<\/span><\/div>\n<\/li>\n<li>\n<div class=\" col-md-8\"><span style=\"color: #000000;\">No residue remains after combustion.<\/span><\/div>\n<\/li>\n<\/ul>\n<div class=\" col-md-8\"><span style=\"color: #000000;\"><strong>4. Compare LPG and wood as fuels.<br \/>\n<\/strong><strong>Answer &#8211;\u00a0<\/strong><\/span><\/div>\n<div>\n<table>\n<thead>\n<tr>\n<th style=\"text-align: center;\" align=\"center\"><span style=\"color: #000000;\">LPG<\/span><\/th>\n<th style=\"text-align: center;\" align=\"center\"><span style=\"color: #000000;\">Wood<\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align: justify;\" align=\"center\"><span style=\"color: #000000;\">LPG is a gaseous fuel.<\/span><\/td>\n<td style=\"text-align: justify;\" align=\"center\"><span style=\"color: #000000;\">Wood is a solid fuel.<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: justify;\" align=\"center\"><span style=\"color: #000000;\">LPG has a higher calorific value of 55000 kJ\/kg.<\/span><\/td>\n<td style=\"text-align: justify;\" align=\"center\"><span style=\"color: #000000;\">Wood has a lower calorific value of 17000 to 22000 kJ\/kg.<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: justify;\" align=\"center\"><span style=\"color: #000000;\">On burning,it leaves no residue.<\/span><\/td>\n<td style=\"text-align: justify;\" align=\"center\"><span style=\"color: #000000;\">On burning, it leaves ash as residue.<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: justify;\" align=\"center\"><span style=\"color: #000000;\">It causes less pollution.<\/span><\/td>\n<td style=\"text-align: justify;\" align=\"center\"><span style=\"color: #000000;\">It causes more pollution.<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: justify;\" align=\"center\"><span style=\"color: #000000;\">It is easy to store.<\/span><\/td>\n<td style=\"text-align: justify;\" align=\"center\"><span style=\"color: #000000;\">It requires a lot of space.<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: justify;\" align=\"center\"><span style=\"color: #000000;\">It can be easily transported in cylinders or pipelines.<\/span><\/td>\n<td style=\"text-align: justify;\" align=\"center\"><span style=\"color: #000000;\">It is difficult to transport wood.<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: justify;\" align=\"center\"><span style=\"color: #000000;\">It does not cause any pollution.<\/span><\/td>\n<td style=\"text-align: justify;\" align=\"center\"><span style=\"color: #000000;\">It causes pollution due to the residue and smoke.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>5. Give reasons.<br \/>\n<\/strong><strong>(a)<\/strong> Water is not used to control fires involving electrical equipment.<br \/>\n<strong>(b)<\/strong> LPG is a better domestic fuel than wood.<br \/>\n<strong>(c)<\/strong> Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>Answer &#8211;<br \/>\n<\/strong><strong>(a) <\/strong>Water is a good conductor of electricity. If it is used for controlling a fire involving electrical equipments, then the person dousing the fire might get an electric shock. Also, water can damage electrical equipments.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>(b)\u00a0<\/strong>LPG is a better domestic fuel as it does not produce smoke and unburnt carbon particles, which cause respiratory problems.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>(c)\u00a0<\/strong>A piece of paper wrapped around aluminium pipe does not catch fire easily. This is because aluminium, being a metal, is a good conductor of heat. Therefore, heat is transferred from the paper to the metal and the paper does not attain its ignition temperature.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>6. Make a labelled diagram of a candle flame.<br \/>\n<\/strong><strong>Answer &#8211;<\/strong><\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-3692\" src=\"https:\/\/theexampillar.com\/ncert\/wp-content\/uploads\/2022\/12\/NCERT-Solutions-Class-8-Science-Ch-6-Q6.png\" alt=\"NCERT Class 8 Solutions Science \" width=\"551\" height=\"258\" srcset=\"https:\/\/theexampillar.com\/ncert\/wp-content\/uploads\/2022\/12\/NCERT-Solutions-Class-8-Science-Ch-6-Q6.png 750w, https:\/\/theexampillar.com\/ncert\/wp-content\/uploads\/2022\/12\/NCERT-Solutions-Class-8-Science-Ch-6-Q6-300x140.png 300w, https:\/\/theexampillar.com\/ncert\/wp-content\/uploads\/2022\/12\/NCERT-Solutions-Class-8-Science-Ch-6-Q6-480x225.png 480w\" sizes=\"auto, (max-width: 551px) 100vw, 551px\" \/><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>7. Name the unit in which the calorific value of a fuel is expressed.<br \/>\n<\/strong><strong>Answer &#8211;\u00a0 <\/strong>The calorific value of a fuel is expressed in kilojoules per kilogram (kJ\/kg).<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>8. Explain how CO<sub>2<\/sub> is able to control fires.<br \/>\n<\/strong><strong>Answer &#8211;\u00a0 <\/strong>CO<sub>2<\/sub>\u00a0is a non-combustible gas and extinguishes fire in two ways:<br \/>\n<strong>(i)<\/strong> It is heavier than oxygen and covers the fire like a blanket and cuts off the contact between oxygen and fuel.<br \/>\n<strong>(ii)<\/strong> In cylinders, CO<sub>2<\/sub>\u00a0is kept in the liquid form. When released, it expands enormously. This brings down the temperature of the fuel, which helps in controlling the fire.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>9. It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Explain.<br \/>\n<\/strong><strong>Answer &#8211;\u00a0 <\/strong>Green leaves have a lot of moisture in them. This moisture does not allow them to catch fire easily. However, dry leaves have no moisture in them. Therefore, they catch fire easily.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>10. Which zone of a flame does a goldsmith use for melting gold and silver and why?<br \/>\n<\/strong><strong>Answer &#8211;\u00a0<\/strong>Goldsmiths use the outermost part\/zone of the flame to melt gold and silver. This is because the outermost zone of the flame undergoes complete combustion and is the hottest part of the flame.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>11. In an experiment, 4.5 kg of a fuel was completely burnt. The heat produced was measured to be 180,000 kJ. Calculate the calorific value of the fuel.<br \/>\n<\/strong><strong>Answer &#8211; <\/strong>Heat produced by 4.5 kg of fuel = 180000 kJ<br \/>\nTherefore, heat produced by 1 kg of fuel = <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/gif.latex?\\frac{180000}{4.5}\" alt=\"\\frac{180000}{4.5}\" align=\"absmiddle\" \/> kJ\/kg = 40,000 kJ\/kg<br \/>\nHence, the calorific value of the fuel if 40,000 kJ\/kg.\u00a0<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>12. Can the process of rusting be called combustion? Discuss.<\/strong><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>Answer &#8211;\u00a0 <\/strong>No, because rusting is an exothermic process as heat is liberated during rusting. On the other hand, combustion is a chemical process in which a substance reacts with oxygen to release energy in the form of heat or light.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>13. Abida and Ramesh were doing an experiment in which water was to be heated in a beaker. Abida kept the beaker near the wick in the yellow part of the candle flame. Ramesh kept the beaker in the outermost part of the flame. Whose water will get heated in a shorter time?<\/strong><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>Answer &#8211;\u00a0<\/strong>The water in the Ramesh&#8217;s beaker will heat up in a shorter time. This is because the outermost zone of a flame is the hottest zone, while the yellow zone (in which Abida had kept the beaker) is less hot.<\/span><\/p>\n<p>&nbsp;<\/p>\n<table style=\"width: 100%; border-collapse: collapse;\" border=\"1\">\n<tbody>\n<tr style=\"height: 32px;\">\n<td style=\"width: 100%; background-color: #f2e079; text-align: center; height: 32px;\"><span style=\"color: #ff0000; font-size: 14pt;\"><strong>NCERT Class 8<sup>th\u00a0<\/sup>Solution\u00a0<\/strong><\/span><\/td>\n<\/tr>\n<tr style=\"height: 28px;\">\n<td style=\"width: 100%; text-align: left; height: 28px;\"><span style=\"font-size: 14pt;\"><strong><span style=\"font-family: georgia, palatino, serif; font-size: 12pt;\"><a class=\"row-title\" href=\"https:\/\/theexampillar.com\/ncert\/ncert-solutions-class-8-english\/\" target=\"_blank\" rel=\"noopener\" aria-label=\"\u201cNCERT Solutions Class 6 English\u201d (Edit)\">NCERT Solutions Class 8 English<\/a><\/span><\/strong><\/span><\/td>\n<\/tr>\n<tr style=\"height: 28px;\">\n<td style=\"width: 100%; text-align: left; height: 28px;\"><span style=\"font-size: 14pt;\"><strong><span style=\"font-family: georgia, palatino, serif; font-size: 12pt;\"><a class=\"row-title\" href=\"https:\/\/theexampillar.com\/ncert\/ncert-solutions-class-8-hindi\/\" aria-label=\"\u201cNCERT Solutions Class 6 Maths\u201d (Edit)\">NCERT Solutions Class 8 Hindi<\/a><\/span><\/strong><\/span><\/td>\n<\/tr>\n<tr style=\"height: 28px;\">\n<td style=\"width: 100%; text-align: left; height: 28px;\"><span style=\"font-size: 14pt;\"><strong><span style=\"font-family: georgia, palatino, serif; font-size: 12pt;\"><a class=\"row-title\" href=\"https:\/\/theexampillar.com\/ncert\/ncert-solutions-class-8-maths\/\" target=\"_blank\" rel=\"noopener\" aria-label=\"\u201cNCERT Solutions Class 6 Maths\u201d (Edit)\">NCERT Solutions Class 8 Mathematics<\/a>\u00a0<\/span><\/strong><\/span><\/td>\n<\/tr>\n<tr style=\"height: 28px;\">\n<td style=\"width: 100%; text-align: left; height: 28px;\"><a href=\"https:\/\/theexampillar.com\/ncert\/ncert-solutions-class-8-sanskrit-ruchira\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-size: 14pt;\"><strong><span style=\"font-family: georgia, palatino, serif; font-size: 12pt;\">NCERT Solutions Class 8 Sanskrit<\/span><\/strong><\/span><\/a><\/td>\n<\/tr>\n<tr style=\"height: 28px;\">\n<td style=\"width: 100%; text-align: left; height: 28px;\"><span style=\"font-size: 14pt;\"><strong><span style=\"font-family: georgia, palatino, serif; font-size: 12pt;\"><a class=\"row-title\" href=\"https:\/\/theexampillar.com\/ncert\/ncert-solutions-class-8-science\/\" target=\"_blank\" rel=\"noopener\" aria-label=\"\u201cNCERT Solutions Class 6 Social Science\u201d (Edit)\">NCERT Solutions Class 8 Science<\/a><\/span><\/strong><\/span><\/td>\n<\/tr>\n<tr style=\"height: 28px;\">\n<td style=\"width: 100%; text-align: left; height: 28px;\"><span style=\"font-size: 14pt;\"><strong><span style=\"font-family: georgia, palatino, serif; font-size: 12pt;\"><a class=\"row-title\" href=\"https:\/\/theexampillar.com\/ncert\/ncert-solutions-class-8-social-science\/\" target=\"_blank\" rel=\"noopener\" aria-label=\"\u201cNCERT Solutions Class 6 Social Science\u201d (Edit)\">NCERT Solutions Class 8 Social Science<\/a><\/span><\/strong><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"<p>NCERT Solutions Class 8 Science\u00a0 The NCERT Solutions in English Language for Class 8 Science Chapter &#8211; 6 (Combustion and Flame) has been provided here to help the students in solving the questions from this exercise. Chapter &#8211; 6 (Combustion and Flame) 1. List conditions under which combustion can take place. Answer &#8211;\u00a0 The conditions [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[535],"tags":[547,548,538,5],"class_list":["post-3649","post","type-post","status-publish","format-standard","hentry","category-class-8-science","tag-ncert-class-8-science-chapter-6-combustion-and-flame-in-english","tag-ncert-solutions-class-8-science-chapter-6-in-english","tag-ncert-solutions-class-8-science-in-english","tag-ncert-solutions-in-english"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.9 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>NCERT Solutions Class 8 Science Chapter 6 Combustion and Flame | TheExamPillar NCERT<\/title>\n<meta name=\"description\" content=\"NCERT Solutions Class 8 Science\u00a0The NCERT Solutions in English Language for Class 8 Science Chapter - 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