{"id":4270,"date":"2016-05-13T11:49:00","date_gmt":"2016-05-13T06:19:00","guid":{"rendered":"http:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-science-physical-and-chemical-changes\/"},"modified":"2018-07-05T12:36:26","modified_gmt":"2018-07-05T07:06:26","slug":"ncert-solutions-for-class-7-science-physical-and-chemical-changes","status":"publish","type":"post","link":"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-science-physical-and-chemical-changes\/","title":{"rendered":"NCERT solutions for Class 7 Science Physical and chemical changes"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_76 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\" style=\"cursor:inherit\">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\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><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><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-science-physical-and-chemical-changes\/#NCERT_Class_8_Social_Science_Chapter_wise_Solutions\" >NCERT Class 8 Social Science Chapter wise Solutions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-science-physical-and-chemical-changes\/#NCERT_solutions_for_Class_7_Science_Physical_and_chemical_changes\" >NCERT solutions for Class 7 Science Physical and chemical changes<\/a><ul class='ez-toc-list-level-6' ><li class='ez-toc-heading-level-6'><ul class='ez-toc-list-level-6' ><li class='ez-toc-heading-level-6'><ul class='ez-toc-list-level-6' ><li class='ez-toc-heading-level-6'><ul class='ez-toc-list-level-6' ><li class='ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-science-physical-and-chemical-changes\/#Class%E2%80%93VII_CHAPTER-06\" >Class\u2013VII (CHAPTER-06)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-science-physical-and-chemical-changes\/#PHYSICAL_AND_CHEMICAL_CHANGES\" >PHYSICAL AND CHEMICAL CHANGES<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-science-physical-and-chemical-changes\/#Question_1Classify_the_changes_involved_in_the_following_processes_as_physical_or_chemical_changes\" >Question 1.Classify the changes involved in the following processes as physical or chemical changes:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-science-physical-and-chemical-changes\/#Question_2State_whether_the_following_statements_are_true_or_false_In_case_a_statement_is_false_write_the_corrected_statement_in_your_notebook\" >Question 2.State whether the following statements are true or false. In case a statement is false, write the corrected statement in your notebook.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-science-physical-and-chemical-changes\/#Question_3Fill_in_the_blanks_in_the_following_statements\" >Question 3.Fill in the blanks in the following statements:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-science-physical-and-chemical-changes\/#Question_4When_baking_soda_is_mixed_with_lemon_juice_bubbles_are_formed_with_the_evolution_of_a_gas_What_type_of_change_is_it_Explain\" >Question 4.When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-science-physical-and-chemical-changes\/#Question_5When_candle_burns_both_physical_and_chemical_changes_take_place_Identify_these_changes_Give_another_example_of_familiar_process_in_which_both_the_chemical_and_physical_changes_take_place\" >Question 5.When candle burns, both physical and chemical changes take place. Identify these changes. Give another example of familiar process in which both the chemical and physical changes take place.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-science-physical-and-chemical-changes\/#Question_6How_would_you_show_that_setting_of_curd_is_a_chemical_change\" >Question 6.How would you show that setting of curd is a chemical change?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-science-physical-and-chemical-changes\/#Question_7Explain_why_burning_of_wood_and_cutting_it_into_small_pieces_are_considered_as_two_different_types_of_changes\" >Question 7.Explain why burning of wood and cutting it into small pieces are considere^d as two different types of changes.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-science-physical-and-chemical-changes\/#Question_8Describe_how_crystals_of_copper_sulphate_are_prepared\" >Question 8.Describe how crystals of copper sulphate are prepared.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-science-physical-and-chemical-changes\/#Question_9Explain_how_painting_of_an_iron_gate_prevents_it_from_rusting\" >Question 9.Explain how painting of an iron gate prevents it from rusting.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-science-physical-and-chemical-changes\/#Question_10Explain_why_rusting_of_iron_objects_is_faster_in_coastal_areas_than_in_deserts\" >Question 10.Explain why rusting of iron objects is faster in coastal areas than in deserts.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-science-physical-and-chemical-changes\/#Question_11The_gas_we_use_in_the_kitchen_is_called_liquefied_petroleum_gas_LPG_In_the_cylinder_it_exists_as_liquid_When_it_comes_out_from_the_cylinder_it_becomes_a_gas_change_A_then_it_burns_change_B_The_following_statement_s_are_pertain_to_these_changes_Choose_the_correct_one\" >Question 11.The gas we use in the kitchen is called liquefied petroleum gas (LPG). In the cylinder it exists as liquid. When it comes out from the cylinder it becomes a gas (change A) then it burns (change B). The following statement s are pertain to these changes. Choose the correct one.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-science-physical-and-chemical-changes\/#Question_12Aerobic_bacteria_digests_animal_waste_and_produce_biogas_change_%E2%80%93AThe_biogas_is_then_burnt_as_fuelchange-B_The_following_statements_pertain_to_these_changes_Choose_the_correct_one\" >Question 12Aerobic bacteria digests animal waste and produce biogas (change \u2013A).The biogas is then burnt as fuel(change-B). The following statements pertain to these changes. Choose the correct one.<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-science-physical-and-chemical-changes\/#NCERT_solutions_for_Class_7_Science\" >NCERT solutions for Class 7 Science<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-science-physical-and-chemical-changes\/#CBSE_app_for_Class_7\" >CBSE app for Class 7<\/a><\/li><\/ul><\/nav><\/div>\n<p>NCERT solutions for Class 7 Science Physical and chemical changes book solutions are available in PDF format for free download. These ncert book chapter wise questions and answers are very helpful for CBSE exam. CBSE recommends NCERT books and most of the questions in CBSE exam are asked from NCERT text books. Class 7 Science chapter wise NCERT solution for Science Book all the chapters can be downloaded from our website and myCBSEguide mobile app for free.<\/p>\n<p style=\"text-align: center;\"><strong>NCERT solutions for Science\u00a0Physical and chemical changes <a class=\"button\" href=\"https:\/\/mycbseguide.com\/downloads\/cbse-class-07-science\/1525\/ncert-solutions\/5\/\">Download as PDF<\/a><\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/media-mycbseguide.s3.ap-south-1.amazonaws.com\/images\/blog\/07_Science_Book.jpg\" alt=\"NCERT solutions for Class 7 Science Physical and chemical changes\" width=\"153\" height=\"194\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Class_8_Social_Science_Chapter_wise_Solutions\"><\/span>NCERT Class 8 Social Science Chapter wise Solutions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ol>\n<li>Nutrition in Plants<\/li>\n<li>Nutrition in Animals<\/li>\n<li>Fibre To Fabric<\/li>\n<li>Heat<\/li>\n<li>Acids Bases And Salts<\/li>\n<li>Physical And Chemical Changes<\/li>\n<li>Climate<\/li>\n<li>Winds Storms And Cyclones<\/li>\n<li>Soil<\/li>\n<li>Respiration In Organisms<\/li>\n<li>Transportation in Animals And Plants<\/li>\n<li>Reproduction In Plants<\/li>\n<li>Motion And Time<\/li>\n<li>Electric Current And Its Effects<\/li>\n<li>Light<\/li>\n<li>Water<\/li>\n<li>Forests: Our Lifeline<\/li>\n<li>Waste Water Story<\/li>\n<\/ol>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_solutions_for_Class_7_Science_Physical_and_chemical_changes\"><\/span>NCERT solutions for Class 7 Science Physical and chemical changes<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h6 style=\"text-align: center;\"><span class=\"ez-toc-section\" id=\"Class%E2%80%93VII_CHAPTER-06\"><\/span><strong>Class\u2013VII (CHAPTER-06)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<h6 style=\"text-align: center;\"><span class=\"ez-toc-section\" id=\"PHYSICAL_AND_CHEMICAL_CHANGES\"><\/span><strong>PHYSICAL AND CHEMICAL CHANGES<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<h6><span class=\"ez-toc-section\" id=\"Question_1Classify_the_changes_involved_in_the_following_processes_as_physical_or_chemical_changes\"><\/span><strong>Question 1.<\/strong>Classify the changes involved in the following processes as physical or chemical changes:<span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p>(a)Photosynthesis<\/p>\n<p>(b)Dissolving sugar in water<\/p>\n<p>(c)Burning of coal<\/p>\n<p>(d)Melting of wax<\/p>\n<p>(e)Beating aluminum to make aluminum foil.<\/p>\n<p>(f)Digestion of food<\/p>\n<p><strong>Answer:<\/strong><\/p>\n<p>(a) Chemical change<\/p>\n<p>(b) Physical changes<\/p>\n<p>(c) Chemical change<\/p>\n<p>(d) Physical change<\/p>\n<p>(e) Physical change<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT solutions for Class 7 Science Physical and chemical changes<\/p>\n<h6><span class=\"ez-toc-section\" id=\"Question_2State_whether_the_following_statements_are_true_or_false_In_case_a_statement_is_false_write_the_corrected_statement_in_your_notebook\"><\/span><strong>Question<\/strong> 2.State whether the following statements are true or false. In case a statement is false, write the corrected statement in your notebook.<span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p>(a)Cutting of log of wood into pieces is a chemical change. (True\/False)<\/p>\n<p>(b)Formation of manure from leaves is a physical change. (True\/False)<\/p>\n<p>(c)Iron pipes coated with zinc do not get rusted easily. (True\/False)<\/p>\n<p>(d)Iron and rust area same substance. (True\/False)<\/p>\n<p>(e)Condensation of steam is not a chemical change. (True\/False)<\/p>\n<p><strong>Answer:<\/strong><\/p>\n<p>(a) False- cutting a log of wood into pieces is a physical change.<\/p>\n<p>(b) False- formation of manure from leaves is a chemical change.<\/p>\n<p>(c) True<\/p>\n<p>(d) False- Iron and rust are different substances.<\/p>\n<p>(e) True<\/p>\n<hr \/>\n<h6><span class=\"ez-toc-section\" id=\"Question_3Fill_in_the_blanks_in_the_following_statements\"><\/span><strong>Question<\/strong> 3.Fill in the blanks in the following statements:<span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p>(a)When carbon dioxide is passed through lime water, it turns milky due to formation of &#8212;&#8212;&#8212;&#8211;.<\/p>\n<p>(b)The chemical name of baking soda is &#8212;&#8212;&#8212;&#8212;-.<\/p>\n<p>(c)Two methods by which rusting of iron can be prevented are &#8212;&#8212;&#8212; and &#8212;&#8212;.<\/p>\n<p>(d)Changes in which only &#8212;&#8212;&#8212;&#8212; properties of a substance change are called physical changes.<\/p>\n<p>(e)Changes in which new substances are formed are called &#8212;&#8212;&#8212;&#8211; changes.<\/p>\n<p><strong>Answer:<\/strong><\/p>\n<p>Fill in the blanks in the following statements:<\/p>\n<p>(a) When carbon dioxide is passed through lime water, it turns milky due to formation of <strong>calcium carbonate<\/strong>.<\/p>\n<p>(b)The chemical name of baking soda is <strong>sodium hydrogen carbonate<\/strong>.<\/p>\n<p>(c) Two methods by which rusting of iron can be prevented are <strong>painting<\/strong> and <strong>galvanization<\/strong>.<\/p>\n<p>(d) Changes in which only <strong>physical<\/strong> properties of a substance change are called physical changes.<\/p>\n<p>(e) Changes in which new substances are formed are called <strong>chemical<\/strong> changes.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT solutions for Class 7 Science Physical and chemical changes<\/p>\n<h6><span class=\"ez-toc-section\" id=\"Question_4When_baking_soda_is_mixed_with_lemon_juice_bubbles_are_formed_with_the_evolution_of_a_gas_What_type_of_change_is_it_Explain\"><\/span><strong>Question<\/strong> 4.When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.<span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>Answer:<\/strong><\/p>\n<p>It is a chemical change. Here, a new substance, carbon dioxide is formed..<\/p>\n<hr \/>\n<h6><span class=\"ez-toc-section\" id=\"Question_5When_candle_burns_both_physical_and_chemical_changes_take_place_Identify_these_changes_Give_another_example_of_familiar_process_in_which_both_the_chemical_and_physical_changes_take_place\"><\/span><strong>Question<\/strong> 5.When candle burns, both physical and chemical changes take place. Identify these changes. Give another example of familiar process in which both the chemical and physical changes take place.<span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>Answer:<\/strong><\/p>\n<p>The wax of the candle first melt then vaporizes and burns.<\/p>\n<p>Melting f wax is a physical change since melted wax can be solidified back to the wax andthere is not new substance is formed.<\/p>\n<p>When wax burns, smoke and carbon dioxide is formed which are new substance. So, it is a chemical change.<\/p>\n<p>Lightening of bulb using a dry cell is a chemical as well as physical change. Chemical reaction inside the dry cell produce current and lighting is conversion of electrical energy to light energy.<\/p>\n<hr \/>\n<h6><span class=\"ez-toc-section\" id=\"Question_6How_would_you_show_that_setting_of_curd_is_a_chemical_change\"><\/span><strong>Question<\/strong> 6.How would you show that setting of curd is a chemical change?<span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>Answer:<\/strong><\/p>\n<p>When some sour substance is added to milk or kept overnight, it turns into curd. The curd is no way can be converted into milk. Curd is a different substance than milk. So, formation of curd is a chemical change.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT solutions for Class 7 Science Physical and chemical changes<\/p>\n<h6><span class=\"ez-toc-section\" id=\"Question_7Explain_why_burning_of_wood_and_cutting_it_into_small_pieces_are_considered_as_two_different_types_of_changes\"><\/span><strong>Question<\/strong> 7.Explain why burning of wood and cutting it into small pieces are considere^d as two different types of changes.<span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>Answer:<\/strong><\/p>\n<p>Burning of wood produces ash and smoke. Hence the properties of wood are changed andnew substances are formed. So, it is a chemical change.<\/p>\n<p>When a log of wood is cut into small pieces, there is no new substance formed. Each smallpiece bears the properties of wood. So, it is a physical change. Obviously, burning andcutting of wood are two different types of changes.<\/p>\n<hr \/>\n<h6><span class=\"ez-toc-section\" id=\"Question_8Describe_how_crystals_of_copper_sulphate_are_prepared\"><\/span><strong>Question<\/strong> 8.Describe how crystals of copper sulphate are prepared.<span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>Answer:<\/strong><\/p>\n<p>A cup of water is taken in a beaker and a few drops of dilute Sulphuric acid are added into it. The water is heated. When it start boiling copper sulphate powder is added slowly while stirring continuously till no more powder can be dissolved. The solution is filtered and allowed to cool down. Crystal of Copper sulphate slowly forms at the bottom of the beaker.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT solutions for Class 7 Science Physical and chemical changes<\/p>\n<h6><span class=\"ez-toc-section\" id=\"Question_9Explain_how_painting_of_an_iron_gate_prevents_it_from_rusting\"><\/span><strong>Question<\/strong> 9.Explain how painting of an iron gate prevents it from rusting.<span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>Answer:<\/strong><\/p>\n<p>For rusting, iron must be in contact with both air and moisture. When iron gate is painted the layer of paint cuts the contact between air, moisture and iron. Thus, it prevents rusting.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT solutions for Class 7 Science Physical and chemical changes<\/p>\n<h6><span class=\"ez-toc-section\" id=\"Question_10Explain_why_rusting_of_iron_objects_is_faster_in_coastal_areas_than_in_deserts\"><\/span><strong>Question<\/strong> 10.Explain why rusting of iron objects is faster in coastal areas than in deserts.<span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>Answer:<\/strong><\/p>\n<p>In coastal areas there is more moisture in air due to the presence of sea. But, in desert there is a scarcity of water and hence air is almost dry there. Both air and moisture are necessary conditions for rusting. So, rusting is faster is coastal areas than in desert.<\/p>\n<hr \/>\n<h6><span class=\"ez-toc-section\" id=\"Question_11The_gas_we_use_in_the_kitchen_is_called_liquefied_petroleum_gas_LPG_In_the_cylinder_it_exists_as_liquid_When_it_comes_out_from_the_cylinder_it_becomes_a_gas_change_A_then_it_burns_change_B_The_following_statement_s_are_pertain_to_these_changes_Choose_the_correct_one\"><\/span><strong>Question<\/strong> 11.The gas we use in the kitchen is called liquefied petroleum gas (LPG). In the cylinder it exists as liquid. When it comes out from the cylinder it becomes a gas (change A) then it burns (change B). The following statement s are pertain to these changes. Choose the correct one.<span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p>(i)Process \u2013 A is a chemical change.<\/p>\n<p>(ii)Process \u2013B is chemical change.<\/p>\n<p>(iii)Both processes A and B is a chemical changes.<\/p>\n<p>(iv)None of these processes is a chemical change.<\/p>\n<p><strong>Answer:<\/strong><\/p>\n<p>(ii) Process \u2013B is a chemical change.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT solutions for Class 7 Science Physical and chemical changes<\/p>\n<h6><span class=\"ez-toc-section\" id=\"Question_12Aerobic_bacteria_digests_animal_waste_and_produce_biogas_change_%E2%80%93AThe_biogas_is_then_burnt_as_fuelchange-B_The_following_statements_pertain_to_these_changes_Choose_the_correct_one\"><\/span><strong>Question<\/strong> 12Aerobic bacteria digests animal waste and produce biogas (change \u2013A).The biogas is then burnt as fuel(change-B). The following statements pertain to these changes. Choose the correct one.<span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p>(i)Process \u2013 A is a chemical change.<\/p>\n<p>(ii)Process \u2013B is a chemical change.<\/p>\n<p>(iii)Both processes A and B are chemical changes.<\/p>\n<p>(iv)None of these process is a chemical changes.<\/p>\n<p><strong>Answer:<\/strong><\/p>\n<p>(iii) Both processes A and B are chemical changes.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_solutions_for_Class_7_Science\"><\/span>NCERT solutions for Class 7 Science<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>NCERT Solutions Class 7 Science PDF (Download) Free from myCBSEguide app and myCBSEguide website. Ncert solution class 7 Science includes text book solutions for CBSE Class 7 Science have total 18 chapters. 7 Science NCERT Solutions in PDF for free Download on our website. Ncert Science class 7 solutions PDF and Social Science ncert class 7 PDF solutions with latest modifications and as per the latest CBSE syllabus are only available in myCBSEguide.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"CBSE_app_for_Class_7\"><\/span>CBSE app for Class 7<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>To download\u00a0NCERT Solutions for class 7 Social Science, Computer Science, Hindi ,English, Maths Science do check myCBSEguide app or website. myCBSEguide provides sample papers with solution, test papers for chapter-wise practice, NCERT solutions, NCERT Exemplar solutions, quick revision notes for ready reference, CBSE guess papers and CBSE important question papers. Sample Paper all are made available through\u00a0<a href=\"https:\/\/play.google.com\/store\/apps\/details?id=in.techchefs.MyCBSEGuide&amp;referrer=utm_source%3Dmycbse_bottom%26utm_medium%3Dtext%26utm_campaign%3Dmycbseads\"><strong>the best app for CBSE students<\/strong><\/a>\u00a0and myCBSEguide website.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>NCERT solutions for Class 7 Science Physical and chemical changes book solutions are available in PDF format for free download. These ncert book chapter wise questions and answers are very helpful for CBSE exam. CBSE recommends NCERT books and most of the questions in CBSE exam are asked from NCERT text books. Class 7 Science &#8230; <a title=\"NCERT solutions for Class 7 Science Physical and chemical changes\" class=\"read-more\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-science-physical-and-chemical-changes\/\" aria-label=\"More on NCERT solutions for Class 7 Science Physical and chemical changes\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":-1,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[281,1390],"tags":[283,1535,216,349],"class_list":["post-4270","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ncert-solutions","category-science-cbse-class-07","tag-cbse-study-material","tag-class-7","tag-ncert-solutions","tag-science"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>NCERT solutions for Class 7 Science Physical and chemical changes<\/title>\n<meta name=\"description\" content=\"NCERT solutions for Class 7 Science Physical and chemical changes in PDF format for free download. 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