{"id":22074,"date":"2018-11-21T10:58:00","date_gmt":"2018-11-21T05:28:00","guid":{"rendered":"http:\/\/mycbseguide.com\/blog\/?p=22074"},"modified":"2018-12-17T14:26:42","modified_gmt":"2018-12-17T08:56:42","slug":"cbse-question-paper-2015-class-12-chemistry","status":"publish","type":"post","link":"https:\/\/mycbseguide.com\/blog\/cbse-question-paper-2015-class-12-chemistry\/","title":{"rendered":"CBSE Question Paper 2015 class 12 Chemistry"},"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\/cbse-question-paper-2015-class-12-chemistry\/#Class_12_Chemistry_list_of_chapters\" >Class 12 Chemistry list of chapters<\/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\/cbse-question-paper-2015-class-12-chemistry\/#CBSE_Question_Paper_2015_class_12_Chemistry\" >CBSE Question Paper 2015 class 12 Chemistry<\/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:\/\/mycbseguide.com\/blog\/cbse-question-paper-2015-class-12-chemistry\/#General_Instructions\" >General Instructions:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/mycbseguide.com\/blog\/cbse-question-paper-2015-class-12-chemistry\/#OR\" >OR<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/mycbseguide.com\/blog\/cbse-question-paper-2015-class-12-chemistry\/#OR-2\" >OR<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/mycbseguide.com\/blog\/cbse-question-paper-2015-class-12-chemistry\/#OR-3\" >OR<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/mycbseguide.com\/blog\/cbse-question-paper-2015-class-12-chemistry\/#OR-4\" >OR<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/mycbseguide.com\/blog\/cbse-question-paper-2015-class-12-chemistry\/#OR-5\" >OR<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/mycbseguide.com\/blog\/cbse-question-paper-2015-class-12-chemistry\/#Chemistry_Question_Paper_2015\" >Chemistry Question Paper 2015<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/mycbseguide.com\/blog\/cbse-question-paper-2015-class-12-chemistry\/#Previous_Year_Question_Paper_for_class_12_in_PDF\" >Previous Year Question Paper for class 12 in PDF<\/a><\/li><\/ul><\/nav><\/div>\n<p><strong>CBSE Question Paper 2015 class 12 Chemistry<\/strong>\u00a0conducted by Central Board of Secondary Education, New Delhi in the month of March 2015. CBSE previous year question papers with the solution are available in the myCBSEguide mobile app and website. The Best CBSE App for students and teachers is myCBSEguide which provides complete study material and practice papers to CBSE schools in India and abroad.<\/p>\n<p style=\"text-align: center;\"><strong>CBSE Question Paper 2015 class 12 Chemistry\u00a0<\/strong><\/p>\n<p style=\"text-align: center;\"><strong><a class=\"button\" href=\"https:\/\/mycbseguide.com\/downloads\/cbse-class-12-chemistry\/1267\/cbse-last-year-papers\/3\/\">Download as PDF<\/a><\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignright\" src=\"https:\/\/media-mycbseguide.s3.ap-south-1.amazonaws.com\/images\/blog\/Class%2012%20Chemistry%20Book%20in%20English.jpg\" alt=\"CBSE Question Paper 2015 class 12 Chemistry\" width=\"124\" height=\"159\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Class_12_Chemistry_list_of_chapters\"><\/span>Class 12 Chemistry list of chapters<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ol>\n<li>The Solid State<\/li>\n<li>Solutions<\/li>\n<li>Electrochemistry<\/li>\n<li>Chemical Kinetics<\/li>\n<li>Surface Chemistry<\/li>\n<li>General Principles and Processes of Isolation of Elements<\/li>\n<li>The p-Block Elements<\/li>\n<li>The d and f Block Elements<\/li>\n<li>Coordination Compounds<\/li>\n<li>Haloalkanes and Haloarenes<\/li>\n<li>Alcohols, Phenols and Ethers<\/li>\n<li>Aldehydes, Ketones and Carboxylic Acids<\/li>\n<li>Amines<\/li>\n<li>Biomolecules<\/li>\n<li>Polymers<\/li>\n<li>Chemistry in Everyday life<\/li>\n<\/ol>\n<h2><span class=\"ez-toc-section\" id=\"CBSE_Question_Paper_2015_class_12_Chemistry\"><\/span>CBSE Question Paper 2015 class 12 Chemistry<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div style=\"text-align: left;\">\n<h3><span class=\"ez-toc-section\" id=\"General_Instructions\"><\/span><strong>General Instructions:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<\/div>\n<div>\n<p><strong>(i)<\/strong> There ae total of 26 questions in all. All questions are compulsory.<br \/>\n<strong>(ii)<\/strong> Question numbers 1 to 5 are very short answers questions carrying 1 mark each.<br \/>\n<strong>(iii)<\/strong> Question numbers 6 to 10 are short answers questions carrying 2 marks each.<br \/>\n<strong>(iv)<\/strong> Question numbers 11 to 22 are also short answer questions carrying 3 marks each.<br \/>\n<strong>(v)<\/strong> Question number 23 is value based question carrying 4 marks.<br \/>\n<strong>(vi)<\/strong> Question numbers 24 to 26 are long answer questions carrying 5 marks each.<\/p>\n<hr \/>\n<p><strong>1. <\/strong>Which stoichiometric defeat in crystals increases the density of a solid?<\/p>\n<p><strong>2.<\/strong> What is meant by \u2018shape selective catalysis\u2019 of reactions?<\/p>\n<p><strong>3.<\/strong> Which of the following is more stable complex and why?<\/p>\n<p><img decoding=\"async\" style=\"height: 25px; width: 91px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image001.png\" \/>\u00a0and <img decoding=\"async\" style=\"height: 25px; width: 76px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image002.png\" \/><\/p>\n<p><strong>4.<\/strong> Write the IUPAC name of the following compound:<\/p>\n<p><img decoding=\"async\" style=\"height: 53px; width: 172px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image003.png\" \/><\/p>\n<p><strong>5.<\/strong> Which would undergo <img decoding=\"async\" style=\"height: 22px; width: 31px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image004.png\" \/>\u00a0reaction faster in the following pair and why?<\/p>\n<p><img decoding=\"async\" style=\"height: 24px; width: 107px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image005.png\" \/>and <img decoding=\"async\" style=\"height: 87px; width: 91px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image006.png\" \/><\/p>\n<p><strong>6.<\/strong> State Raoult\u2019s law for the solution containing volatile components. What is the similarity between Raoult\u2019s law and Henry\u2019s law?<\/p>\n<h3 style=\"text-align: center;\"><span class=\"ez-toc-section\" id=\"OR\"><\/span><strong>OR<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Determine the osmotic pressure of a solution prepared by dissolving <img decoding=\"async\" style=\"height: 24px; width: 73px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image007.png\" \/>\u00a0of <img decoding=\"async\" style=\"height: 24px; width: 47px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image008.png\" \/>\u00a0in 2L of water at <img decoding=\"async\" style=\"height: 22px; width: 25px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image009.png\" \/>C, assuming that is completely dissociated.<br \/>\n(R = 0.0821 L atm <img decoding=\"async\" style=\"height: 20px; width: 28px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image010.png\" \/>\u00a0<img decoding=\"async\" style=\"height: 22px; width: 40px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image011.png\" \/>, Molar mass of <img decoding=\"async\" style=\"height: 24px; width: 47px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image008.png\" \/>\u00a0= 174 g mol<img decoding=\"async\" style=\"height: 20px; width: 15px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image012.png\" \/>)<\/p>\n<p><strong>7.<\/strong> For a first order reaction, show that time required for 99% completion is twice the time required for the completion of 90% of reaction.<\/p>\n<p><strong>8.<\/strong> How do you prepare?<br \/>\n<strong>(a)<\/strong> <img decoding=\"async\" style=\"height: 24px; width: 60px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image013.png\" \/>\u00a0from <img decoding=\"async\" style=\"height: 24px; width: 43px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image014.png\" \/>?<br \/>\n<strong>(b)<\/strong> <img decoding=\"async\" style=\"height: 24px; width: 65px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image015.png\" \/>\u00a0from <img decoding=\"async\" style=\"height: 24px; width: 63px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image016.png\" \/>?<\/p>\n<p><strong>9.<\/strong> Write the mechanism of the following reaction:<br \/>\n<img decoding=\"async\" style=\"height: 33px; width: 225px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image017.png\" \/><\/p>\n<p><strong>10.<\/strong> Arrange the following in the decreasing order of given property indicated:<br \/>\n<strong>(a)<\/strong> <img decoding=\"async\" style=\"height: 24px; width: 217px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image018.png\" \/>\u00a0and <img decoding=\"async\" style=\"height: 24px; width: 33px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image019.png\" \/><br \/>\n<strong>(b)<\/strong> <img decoding=\"async\" style=\"height: 24px; width: 225px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image020.png\" \/>\u00a0and <img decoding=\"async\" style=\"height: 24px; width: 61px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image021.png\" \/><\/p>\n<p><strong>11. (a)<\/strong> What type of semiconductor is obtained when silicon is doped with boron?<br \/>\n<strong>(b)<\/strong> What type of magnetism is shown in the following alignment of magnetic moments?<br \/>\n<img decoding=\"async\" id=\"Picture 1\" style=\"height: 52px; width: 102px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image022.jpg\" \/><br \/>\n<strong>(c)<\/strong> What type of point defect is produced when AgCl is doped with <img decoding=\"async\" style=\"height: 24px; width: 44px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image023.png\" \/>?<\/p>\n<h3 style=\"text-align: center;\"><span class=\"ez-toc-section\" id=\"OR-2\"><\/span><strong>OR<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Niobium crystallises in body-centred cubic structure. If density is 8.55g <img decoding=\"async\" style=\"height: 22px; width: 33px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image024.png\" \/>, calculate atomic radius of niobium using its atomic mass as 93u.<\/p>\n<p><strong>12.<\/strong> 3.9g of benzoic acid dissolved in 49g of benzene shows a depression in freezing point of 1.62K. Calculate the Van\u2019t Hoff factor and predict the nature of solute (associated or dissociated).<br \/>\n(Given: Molar mass of benzoic acid = 122g <img decoding=\"async\" style=\"height: 22px; width: 40px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image011.png\" \/>, <img decoding=\"async\" style=\"height: 25px; width: 24px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image025.png\" \/>for benzene = 4.9 K kg <img decoding=\"async\" style=\"height: 22px; width: 40px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image011.png\" \/>)<\/p>\n<p><strong>13. (a)<\/strong> What do you understand by the \u2018order of reaction\u2019? Identify the reaction order from each of the following units of reaction rate constant:<br \/>\n<strong>(i)<\/strong> <img decoding=\"async\" style=\"height: 22px; width: 63px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image026.png\" \/><br \/>\n<strong>(ii)<\/strong> <img decoding=\"async\" style=\"height: 22px; width: 22px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image027.png\" \/><br \/>\n<strong>(b)<\/strong> Give one example of zero order reaction.<\/p>\n<p><strong>14.<\/strong> Explain the following terms:<br \/>\n<strong>(a)<\/strong> Tyndall effect<br \/>\n<strong>(b)<\/strong> Dialysis<br \/>\n<strong>(c)<\/strong> Electrophoresis<\/p>\n<p><strong>15.<\/strong> Write the principles of the following methods:<br \/>\n<strong>(a)<\/strong> Froth flotation method<br \/>\n<strong>(b)<\/strong> Electrolytic refining<br \/>\n<strong>(c)<\/strong> Zone refining<\/p>\n<p><strong>16.<\/strong> Complete the balance the following chemical equations:<br \/>\n<strong>(a)<\/strong> <img decoding=\"async\" style=\"height: 24px; width: 24px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image028.png\" \/>\u00a0+ NaOH (hot and conc.) <img decoding=\"async\" style=\"height: 15px; width: 20px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image029.png\" \/><br \/>\n<strong>(b)<\/strong> <img decoding=\"async\" style=\"height: 24px; width: 157px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image030.png\" \/><br \/>\n<strong>(c)<\/strong> <img decoding=\"async\" style=\"height: 25px; width: 138px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image031.png\" \/><\/p>\n<p><strong>17. (a)<\/strong> Name the element of 3d transition series which shows maximum number of oxidation state.<br \/>\n<strong>(b)<\/strong> Name a member of the lanthanoid series which is well-known to exhibit +2 oxidation state.<br \/>\n<strong>(c)<\/strong> Complete the equation:<br \/>\n<img decoding=\"async\" style=\"height: 25px; width: 148px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image032.png\" \/><\/p>\n<p><strong>18. (a)<\/strong> Draw the geometrical isomers of complex compound <img decoding=\"async\" style=\"height: 24px; width: 100px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image033.png\" \/><br \/>\n<strong>(b)<\/strong> On the basis of crystal field theory, write the electronic configuration for <img decoding=\"async\" style=\"height: 22px; width: 20px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image034.png\" \/>\u00a0ion if <img decoding=\"async\" style=\"height: 24px; width: 48px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image035.png\" \/><br \/>\n<strong>(c)<\/strong> Write the hybridization and magnetic behaviour of the complex compound <img decoding=\"async\" style=\"height: 24px; width: 71px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image036.png\" \/><\/p>\n<p><strong>19.<\/strong> Give reasons for the following:<br \/>\n<strong>(a)<\/strong> The presence of nitro group <img decoding=\"async\" style=\"height: 24px; width: 54px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image037.png\" \/>\u00a0at ortho or Para positions increases the reactivity of haloarenes towards nucleophilic substitution reactions.<br \/>\n<strong>(b)<\/strong> Racemic mixture is optically inactive.<\/p>\n<p><strong>20.<\/strong> Give the structure of A, B and C in the following rections:<br \/>\n<strong>(a)<\/strong> <img decoding=\"async\" style=\"height: 24px; width: 32px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image038.png\" \/>\u00a0&#8211; Br <img decoding=\"async\" style=\"height: 29px; width: 25px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image039.png\" \/>\u00a0A <img decoding=\"async\" style=\"height: 31px; width: 33px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image040.png\" \/>\u00a0B <img decoding=\"async\" style=\"height: 40px; width: 29px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image041.png\" \/>\u00a0C<br \/>\n<strong>(b)<\/strong> <img decoding=\"async\" style=\"height: 24px; width: 80px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image042.png\" \/>\u00a0<img decoding=\"async\" style=\"height: 40px; width: 24px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image043.png\" \/>\u00a0A <img decoding=\"async\" style=\"height: 31px; width: 45px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image044.png\" \/>\u00a0B <img decoding=\"async\" style=\"height: 31px; width: 63px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image045.png\" \/>\u00a0C<\/p>\n<p><strong>21. (a)<\/strong> Deficiency of which vitamin causes scurvy?<br \/>\n<strong>(b)<\/strong> What type of linkage is responsible for the formation of proteins?<br \/>\n<strong>(c)<\/strong> Write the product formed when glucose is treated with HI.<\/p>\n<p><strong>22. (a)<\/strong> What are disinfectants? Give an example.<br \/>\n<strong>(b)<\/strong> Give two examples of macromolecules that are chosen as drug targets.<br \/>\n<strong>(c)<\/strong> What are anionic detergents? Give an example.<\/p>\n<p><strong>23.<\/strong> After the ban on plastic bags, students of one school decided to make the people aware of the harmful effects of plastic bags on environment and Yamuna river. To make the awareness more impactful, they organized rally by joining hands with other schools and distributed paper bags to vegetable vendors, shopkeepers and departmental stores. All students pledged not to use polythene bags in future to save Yamuna river.<br \/>\nAfter reading the above passage, answer the following questions:<br \/>\n<strong>(a)<\/strong> What values are shown by the students.<br \/>\n<strong>(b)<\/strong> What are biodegradable polymers? Give one example.<br \/>\n<strong>(c)<\/strong> Is polythene a consideration or an addition polymer.<\/p>\n<p><strong>24. (a)<\/strong> Explain the following observations:<br \/>\n<strong>(i)<\/strong> The products of electrolysis of molten NaCl are sodium metal and chlorine gas.<br \/>\n<strong>(ii)<\/strong> The products of electrolysis of aqueous sodium chloride are NaOH, <img decoding=\"async\" style=\"height: 24px; width: 24px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image028.png\" \/>\u00a0and <img decoding=\"async\" style=\"height: 24px; width: 23px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image046.png\" \/><br \/>\n<strong>(b)<\/strong> The molar conductivities of <img decoding=\"async\" style=\"height: 25px; width: 40px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image047.png\" \/>\u00a0ion and <img decoding=\"async\" style=\"height: 22px; width: 27px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image048.png\" \/>\u00a0ion are 73.5 s <img decoding=\"async\" style=\"height: 22px; width: 29px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image049.png\" \/><img decoding=\"async\" style=\"height: 22px; width: 40px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image011.png\" \/>\u00a0and 76.25 s <img decoding=\"async\" style=\"height: 22px; width: 29px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image049.png\" \/><img decoding=\"async\" style=\"height: 22px; width: 40px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image011.png\" \/>respectively. The specific conductivity of 0.1M <img decoding=\"async\" style=\"height: 24px; width: 51px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image050.png\" \/>\u00a0is <img decoding=\"async\" style=\"height: 22px; width: 76px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image051.png\" \/>\u00a0s <img decoding=\"async\" style=\"height: 22px; width: 33px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image052.png\" \/>. Calculate the dissociated constant of <img decoding=\"async\" style=\"height: 24px; width: 53px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image053.png\" \/><\/p>\n<h3 style=\"text-align: center;\"><span class=\"ez-toc-section\" id=\"OR-3\"><\/span><strong>OR<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>(a)<\/strong> Describe the principle and overall reaction involved in the working of hydrogen-oxygen fuel cell.<br \/>\n<strong>(b)<\/strong> Write the Nernst equation and calculate the emf of the following cell at 298K:<br \/>\nCu(s)\/ <img decoding=\"async\" style=\"height: 22px; width: 35px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image054.png\" \/>\u00a0(0.13M) <img decoding=\"async\" style=\"height: 22px; width: 11px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image055.png\" \/>\u00a0<img decoding=\"async\" style=\"height: 24px; width: 31px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image056.png\" \/>\u00a0(<img decoding=\"async\" style=\"height: 22px; width: 29px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image057.png\" \/>M) \/Ag(s)<\/p>\n<p><strong>25.<\/strong> Assign a possible reason for the following:<br \/>\n<strong>(a)<\/strong> Fluorine forms only one oxoacid HOF.<br \/>\n<strong>(b)<\/strong> Nitrogen exist as diatomic <img decoding=\"async\" style=\"height: 24px; width: 35px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image058.png\" \/>\u00a0while phosphorus exist as tetratomic <img decoding=\"async\" style=\"height: 24px; width: 31px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image059.png\" \/>\u00a0at room temperature.<br \/>\n<strong>(c)<\/strong> The negative value of the electron gain enthalpy of fluorine is less than that of chlorine.<br \/>\n<strong>(d)<\/strong> Interhalogen compounds are more reactive than halogens.<br \/>\n<strong>(e)<\/strong> <img decoding=\"async\" style=\"height: 24px; width: 49px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image060.png\" \/>\u00a0is a monoprotic acid.<\/p>\n<h3 style=\"text-align: center;\"><span class=\"ez-toc-section\" id=\"OR-4\"><\/span><strong>OR<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>(a)<\/strong> Give reasons for the following:<br \/>\n<strong>(i)<\/strong> <img decoding=\"async\" style=\"height: 24px; width: 32px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image061.png\" \/> has lower boiling point than <img decoding=\"async\" style=\"height: 24px; width: 33px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image019.png\" \/><br \/>\n<strong>(ii)<\/strong> Oxygen shows catenation behaviour less than Sulphur.<br \/>\n<strong>(iii)<\/strong> Helium is used in diving apparatus.<br \/>\n<strong>(b)<\/strong> Draw the structures of the following molecules:<br \/>\n<strong>(i)<\/strong> <img decoding=\"async\" style=\"height: 24px; width: 58px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image062.png\" \/><br \/>\n<strong>(ii)<\/strong> <img decoding=\"async\" style=\"height: 24px; width: 36px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image063.png\" \/><\/p>\n<p><strong>26. (a)<\/strong> Give simple chemical tests to distinguish between the following pairs of compounds:<br \/>\n<strong>(i)<\/strong> Proponal and propanone<br \/>\n<strong>(ii)<\/strong> Benzaldehyde and acetaldehyde<\/p>\n<p><strong>(b)<\/strong> Write the products of the following reactions:<br \/>\n<strong>(i)<\/strong> <img decoding=\"async\" style=\"height: 24px; width: 105px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image064.png\" \/>\u00a0NCONHN<img decoding=\"async\" style=\"height: 24px; width: 23px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image046.png\" \/>\u00a0<img decoding=\"async\" style=\"height: 15px; width: 20px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image029.png\" \/><br \/>\n<strong>(ii)<\/strong> <img decoding=\"async\" style=\"height: 24px; width: 84px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image065.png\" \/>\u00a0conc. NaOH <img decoding=\"async\" style=\"height: 15px; width: 20px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image029.png\" \/><br \/>\n<strong>(iii)<\/strong> <img decoding=\"async\" style=\"height: 33px; width: 134px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image066.png\" \/><\/p>\n<h3 style=\"text-align: center;\"><span class=\"ez-toc-section\" id=\"OR-5\"><\/span><strong>OR<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>(a)<\/strong> Account for the following:<br \/>\n<strong>(i)<\/strong> <img decoding=\"async\" style=\"height: 24px; width: 67px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image067.png\" \/>\u00a0is more reactive than <img decoding=\"async\" style=\"height: 24px; width: 85px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image068.png\" \/>\u00a0towards reaction with HCN.<br \/>\n<strong>(ii)<\/strong> Carboxylic acid is stronger acid than phenol.<br \/>\n<strong>(b)<\/strong> Identify A, B and C in the following sequence of reactions:<br \/>\n<img decoding=\"async\" style=\"height: 24px; width: 67px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image067.png\" \/>\u00a0<img decoding=\"async\" style=\"height: 43px; width: 58px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image069.png\" \/>\u00a0A <img decoding=\"async\" style=\"height: 42px; width: 63px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image070.png\" \/>\u00a0B <img decoding=\"async\" style=\"height: 40px; width: 38px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2015_02\/image071.png\" \/>\u00a0C<\/p>\n<p style=\"text-align: center;\"><strong>These are questions only. To view and download complete question paper with solution install myCBSEguide App from google play store or login to our\u00a0<a href=\"https:\/\/mycbseguide.com\/dashboard\/\">student dashboard<\/a>.<\/strong><\/p>\n<\/div>\n<p style=\"text-align: center;\"><b><strong><a class=\"button\" href=\"https:\/\/play.google.com\/store\/apps\/details?id=in.techchefs.MyCBSEGuide&amp;referrer=utm_source%3Dmycbse_bottom%26utm_medium%3Dtext%26utm_campaign%3Dmycbseads\">Download myCBSEguide App<\/a><\/strong><\/b><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Chemistry_Question_Paper_2015\"><\/span>Chemistry Question Paper 2015<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Download class 12 Chemistry question paper from best CBSE App the myCBSEguide. CBSE class 12 Chemistry question paper 2015 in PDF format with solution will help you to understand the latest question paper pattern and marking scheme of the CBSE board examination. You will get to know the difficulty level of the question paper. CBSE question papers 2015 for class 12 Chemistry have 26 questions with solution.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Previous_Year_Question_Paper_for_class_12_in_PDF\"><\/span>Previous Year Question Paper for class 12 in PDF<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>CBSE question papers 2018, 2017, 2016, 2015, 2014, 2013, 2012, 2011, 2010, 209, 2008, 2007, 2006, 2005 and so on for all the subjects are available under this download link. Practicing real question paper certainly helps students to get confidence and improve performance in weak areas.<\/p>\n<ul>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-physics\/1251\/cbse-last-year-papers\/3\/\">Physics<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-chemistry\/1267\/cbse-last-year-papers\/3\/\">Chemistry<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-mathematics\/1284\/cbse-last-year-papers\/3\/\">Mathematics<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-biology\/1298\/cbse-last-year-papers\/3\/\">Biology<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-accountancy\/1315\/cbse-last-year-papers\/3\/\">Accountancy<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-business-studies\/1727\/cbse-last-year-papers\/3\/\">Business Studies<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-economics\/1327\/cbse-last-year-papers\/3\/\">Economics<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-history\/1869\/cbse-last-year-papers\/3\/\">History<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-geography\/1863\/cbse-last-year-papers\/3\/\">Geography<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-political-science\/1879\/cbse-last-year-papers\/3\/\">Political Science<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-physical-education\/1877\/cbse-last-year-papers\/3\/\">Physical Education<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-computer-science\/1851\/cbse-last-year-papers\/3\/\">Computer Science<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-informatics-practices\/1873\/cbse-last-year-papers\/3\/\">Informatics Practices<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-english-core\/1855\/cbse-last-year-papers\/3\/\">English Core<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-hindi-core\/1865\/cbse-last-year-papers\/3\/\">Hindi Core<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12-hindi-elective\/1867\/cbse-last-year-papers\/3\/\">Hindi Elective<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-12\/1250\/\">Other Subjects<\/a><\/li>\n<\/ul>\n<p>To download CBSE Question Paper 2015 class 12 Accountancy, Chemistry, Physics, History, Political Science, Economics, Geography, Computer Science, Home Science, Business Studies and Home 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>CBSE Question Paper 2015 class 12 Chemistry\u00a0conducted by Central Board of Secondary Education, New Delhi in the month of March 2015. CBSE previous year question papers with the solution are available in the myCBSEguide mobile app and website. The Best CBSE App for students and teachers is myCBSEguide which provides complete study material and practice &#8230; <a title=\"CBSE Question Paper 2015 class 12 Chemistry\" class=\"read-more\" href=\"https:\/\/mycbseguide.com\/blog\/cbse-question-paper-2015-class-12-chemistry\/\" aria-label=\"More on CBSE Question Paper 2015 class 12 Chemistry\">Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1346,1014,1434],"tags":[1527,320,1342,80,1566],"class_list":["post-22074","post","type-post","status-publish","format-standard","hentry","category-cbse","category-cbse-question-papers","category-chemistry-cbse-class-12","tag-cbse-question-paper","tag-chemistry","tag-class-12","tag-last-year-papers","tag-previous-question-paper"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - 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