{"id":22121,"date":"2018-11-22T10:09:11","date_gmt":"2018-11-22T04:39:11","guid":{"rendered":"http:\/\/mycbseguide.com\/blog\/?p=22121"},"modified":"2018-12-17T14:21:53","modified_gmt":"2018-12-17T08:51:53","slug":"cbse-question-paper-2007-class-12-chemistry","status":"publish","type":"post","link":"https:\/\/mycbseguide.com\/blog\/cbse-question-paper-2007-class-12-chemistry\/","title":{"rendered":"CBSE Question Paper 2007 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-2007-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-2007-class-12-chemistry\/#CBSE_Question_Paper_2007_class_12_Chemistry\" >CBSE Question Paper 2007 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-2007-class-12-chemistry\/#General_Instructions\" >General Instructions<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/mycbseguide.com\/blog\/cbse-question-paper-2007-class-12-chemistry\/#Chemistry_Question_Paper_2007\" >Chemistry Question Paper 2007<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/mycbseguide.com\/blog\/cbse-question-paper-2007-class-12-chemistry\/#Previous_Year_Question_Paper_for_class_12_2017_Free_PDF_Download\" >Previous Year Question Paper for class 12 2017 Free PDF Download<\/a><\/li><\/ul><\/nav><\/div>\n<p><strong>CBSE Question Paper 2007 class 12 Chemistry<\/strong>\u00a0conducted by Central Board of Secondary Education, New Delhi in the month of March 2007. 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 2007 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 2007 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_2007_class_12_Chemistry\"><\/span>CBSE Question Paper 2007 class 12 Chemistry<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 style=\"text-align: left;\"><span class=\"ez-toc-section\" id=\"General_Instructions\"><\/span><strong>General Instructions<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<div>\n<ol>\n<li>All questions are compulsory.<\/li>\n<li>Marks for each question are indicated against it.<\/li>\n<li>Question numbers 1 to 5 are very short-answer questions, carrying 1 mark each. Answer these in one word or about one sentence each.<\/li>\n<li>Question numbers 6 to 12 are short-answer questions, carrying 2 marks each.\u00a0Answer these in about 30 words each.<\/li>\n<li>Question numbers 13 to 24 are short-answer questions of 3 marks each. Answer\u00a0these in about 40 words each.<\/li>\n<li>Question numbers 25 to 27 are long-answer questions of 5 marks each. Answer these in about 70 words each.<\/li>\n<li>Use Log Tables, if necessary Use of calculators is not permitted.<\/li>\n<\/ol>\n<hr \/>\n<p><strong>1.<\/strong> What is the coordination number in a rock salt type structure? <strong>[1]<\/strong><\/p>\n<p><strong>2.<\/strong> State Raoult\u2019s law for a binary solution containing volatile components. <strong>[1]<\/strong><\/p>\n<p><strong>3. <\/strong>What is meant by order of a reaction being zero? <strong>[1]<\/strong><\/p>\n<p><strong>4.<\/strong> Write the IUPAC name of the following compound: <strong>[1]<\/strong><br \/>\n<img decoding=\"async\" style=\"height: 27px; width: 140px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image003.png\" \/><\/p>\n<p><strong>5.<\/strong> Mention one commercial use of N,N-Dimethylaniline (DMA). <strong>[1]<\/strong><\/p>\n<p><strong>6.<\/strong> State as a mathematical formula the de Broglie relationship for moving particles. What experimental evidence is available for this concept?<strong> [2]<\/strong><\/p>\n<p style=\"text-align: center;\">OR<\/p>\n<p>Specify the ranges of values for quantum numbers <img decoding=\"async\" style=\"height: 24px; width: 20px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image004.png\" \/>\u00a0and <img decoding=\"async\" style=\"height: 24px; width: 20px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image005.png\" \/>\u00a0for an electron in an atom when the n quantum number value for it is 2. What is the significance of these values for the orbitals? <strong>[2]<\/strong><\/p>\n<p><strong>7.<\/strong> When can an endothermic process be spontaneous? Give an example of such a process.<strong> [2]<\/strong><\/p>\n<p><strong>8.<\/strong> Write balanced chemical equations for the following reactions:<strong> [2]<\/strong><\/p>\n<p><img decoding=\"async\" style=\"height: 25px; width: 155px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image006.png\" \/><\/p>\n<p><img decoding=\"async\" style=\"height: 27px; width: 133px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image007.png\" \/><\/p>\n<p><strong>9.<\/strong> Explain any one of the following statements:<strong> [2]<\/strong><\/p>\n<p>(i) The transition metals are well known for the formation of interstitial compounds.<\/p>\n<p>(ii) The largest number of oxidation states are exhibited by manganese in the first series of transition elements.<\/p>\n<p><strong>10.<\/strong> Draw the three-dimensional representations of (R)- and (S)- butan-2-ol.<strong> [2]<\/strong><\/p>\n<p><strong>11.<\/strong> Write chemical reaction equations to illustrate the following reactions:<strong> [2]<\/strong><\/p>\n<p>(i) Williamson synthesis of ethers<\/p>\n<p>(ii) Reimer-Tiemann reaction<\/p>\n<p><strong>12.<\/strong> Distinguish between addition polymers and condensation polymers and give one example of each class. <strong>[2]<\/strong><\/p>\n<p><strong>13.<\/strong> Answer the following in the light of MO theory:<strong> [3]<\/strong><\/p>\n<p>(a) Which has a higher bond order, <img decoding=\"async\" style=\"height: 25px; width: 73px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image008.png\" \/><\/p>\n<p>(b) Which species is not likely to exist, <img decoding=\"async\" style=\"height: 24px; width: 80px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image009.png\" \/><\/p>\n<p style=\"text-align: center;\">OR<\/p>\n<p>(a) Compare the structural shapes of the following species:<\/p>\n<p><img decoding=\"async\" style=\"height: 24px; width: 84px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image010.png\" \/><\/p>\n<p>(b) What type of intermolecular forces exist between <img decoding=\"async\" style=\"height: 24px; width: 91px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image011.png\" \/>\u00a0present in a mutual solution? <strong>[3]<\/strong><\/p>\n<p><strong>14.<\/strong> (a) Name an element with which silicon can be doped to give an n-type semiconductor.<\/p>\n<p>(b) Which type of crystals exhibits piezoelectricity?<strong> [3]<\/strong><\/p>\n<p><strong>15.<\/strong> The vapour pressure of water is <img decoding=\"async\" style=\"height: 19px; width: 127px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image012.png\" \/>\u00a0Calculate the vapour pressure of a one molal solution of a non-volatile non-ionic solute in water.<strong> [3]<\/strong><\/p>\n<p><strong>16. <\/strong>Using the values of <img decoding=\"async\" style=\"height: 25px; width: 112px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image013.png\" \/>\u00a0given herein, calculate the standard molar Gibbs energy of formation, <img decoding=\"async\" style=\"height: 29px; width: 53px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image014.png\" \/>\u00a0for <img decoding=\"async\" style=\"height: 24px; width: 49px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image015.png\" \/>\u00a0Given: <img decoding=\"async\" style=\"height: 25px; width: 209px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image016.png\" \/><img decoding=\"async\" style=\"height: 27px; width: 233px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image017.png\" \/><img decoding=\"async\" style=\"height: 25px; width: 228px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image018.png\" \/><img decoding=\"async\" style=\"height: 27px; width: 231px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image019.png\" \/><strong>\u00a0[3]<\/strong><\/p>\n<p><strong>17. <\/strong>The rates of most reactions double when their temperature is raised from 298 K to 308 K. Calculate activation energy of such a reaction. <strong>[3]<\/strong><\/p>\n<p><img decoding=\"async\" style=\"height: 29px; width: 267px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image020.png\" \/><\/p>\n<p><strong>18.<\/strong> State what is observed when<\/p>\n<p>(i) the electrodes connected to a battery are dipped into a sol.<\/p>\n<p>(ii) an electrolyte solution is added to a sol.<\/p>\n<p>(iii) an emulsion is subjected to high speed centrifugation.<strong> [3]<\/strong><\/p>\n<p><strong>19.<\/strong> Answer the following questions:<strong> [3]<\/strong><\/p>\n<p>(i) Which element in the first series of transition elements does not exhibit variable oxidation states and why?<\/p>\n<p>(ii) What happens when a solution of copper (II) sulphate is saturated with ammonia?<\/p>\n<p>(iii) Why do actinoids, in general, exhibit a greater range of oxidation states than the lanthanoids?<\/p>\n<p><strong>20.<\/strong> (a) Illustrate the following with an example each:<\/p>\n<p>(i) Linkage isomerism<\/p>\n<p>(ii) Coordination isomerism<\/p>\n<p>(b) Why is <img decoding=\"async\" style=\"height: 29px; width: 64px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image021.png\" \/>\u00a0paramagnetic? <img decoding=\"async\" style=\"height: 27px; width: 65px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image022.png\" \/>\u00a0<strong>[3]<\/strong><\/p>\n<p><strong>21. <\/strong>Write the nuclear reactions for the following radioactive changes: <strong>[3]<\/strong><\/p>\n<p>(i) <img decoding=\"async\" style=\"height: 25px; width: 37px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image023.png\" \/>\u00a0undergoes <img decoding=\"async\" style=\"height: 21px; width: 68px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image024.png\" \/><\/p>\n<p>(ii) <img decoding=\"async\" style=\"height: 25px; width: 39px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image025.png\" \/>\u00a0undergoes <img decoding=\"async\" style=\"height: 21px; width: 68px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image026.png\" \/><\/p>\n<p>(iii) <img decoding=\"async\" style=\"height: 25px; width: 37px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image027.png\" \/>\u00a0undergoes <img decoding=\"async\" style=\"height: 21px; width: 69px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image028.png\" \/><\/p>\n<p>(You can put \u2018X\u2019 for the symbol which is not correctly known)<\/p>\n<p><strong>22. <\/strong>Explain the mechanism of nucleophilic addition to a carbonyl group and give one example of such addition reactions.<strong> [3]<\/strong><\/p>\n<p><strong>23.<\/strong> Write the chemical equations for the following chemical reactions: <strong>[3]<\/strong><\/p>\n<p>(a) 1-Nitropropene is prepared from acetaldehyde<\/p>\n<p>(b) Benzonitrile is converted to acetophenone<\/p>\n<p>(c) A primary amine is prepared from a primary alkyl halide<\/p>\n<p><strong>24. <\/strong>Mention one important use of each of the following:<strong> [3]<\/strong><\/p>\n<p>(i) Equanil<\/p>\n<p>(ii) Sucralose<\/p>\n<p>(iii) Carbon fibres<\/p>\n<p><strong>25.<\/strong> (a) Write the formulation for the galvanic cell in which the reaction,<\/p>\n<p><img decoding=\"async\" style=\"height: 27px; width: 144px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image029.png\" \/><img decoding=\"async\" style=\"height: 27px; width: 131px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image030.png\" \/>\u00a0takes place.<\/p>\n<p>Identify the cathode and the anode reactions in it.<\/p>\n<p>(b) Write Nernst equation and calculate the emf of the following cell:<\/p>\n<p><img decoding=\"async\" style=\"height: 29px; width: 233px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image031.png\" \/><img decoding=\"async\" style=\"height: 27px; width: 141px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image032.png\" \/><\/p>\n<p>(Given <img decoding=\"async\" style=\"height: 27px; width: 120px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image033.png\" \/><strong>\u00a0[2, 3]<\/strong><\/p>\n<p style=\"text-align: center;\">OR<\/p>\n<p>(a) Explain with one example each the terms weak and strong electrolytes.<\/p>\n<p>(b) Write the Nernst equation and calculate the emf of the following cell:<\/p>\n<p><img decoding=\"async\" style=\"height: 29px; width: 224px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image034.png\" \/><img decoding=\"async\" style=\"height: 27px; width: 141px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image032.png\" \/><\/p>\n<p>(Given <img decoding=\"async\" style=\"height: 27px; width: 121px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image035.png\" \/><strong>\u00a0[2, 3]<\/strong><\/p>\n<p><strong>26. <\/strong>(a) How would you account for any two of the following:<\/p>\n<p>(i) <img decoding=\"async\" style=\"height: 24px; width: 39px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image036.png\" \/>\u00a0is a stronger oxidising agent than <img decoding=\"async\" style=\"height: 24px; width: 41px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image037.png\" \/><\/p>\n<p>(ii) <img decoding=\"async\" style=\"height: 24px; width: 49px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image038.png\" \/>\u00a0acts as a monobasic acid.<\/p>\n<p>(iii) The <img decoding=\"async\" style=\"height: 21px; width: 35px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image039.png\" \/>\u00a0value for <img decoding=\"async\" style=\"height: 19px; width: 45px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image040.png\" \/>\u00a0is higher than that of <img decoding=\"async\" style=\"height: 19px; width: 59px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image041.png\" \/><\/p>\n<p>(b) Draw the structures of the following species:<\/p>\n<p>(i) Peroxodisulphuric acid, <img decoding=\"async\" style=\"height: 24px; width: 57px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image042.png\" \/><\/p>\n<p>(ii) Xenon tetrafluoride, <img decoding=\"async\" style=\"height: 24px; width: 40px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image043.png\" \/>\u00a0<strong>[2, 3]<\/strong><\/p>\n<p style=\"text-align: center;\">OR<\/p>\n<p>(a) Assign reasons for any two of the following observations:<\/p>\n<p>(i) The lower oxidation state becomes more stable with increasing atomic number in Group 13.<\/p>\n<p>(ii) Hydrogen iodide is a stronger acid than hydrogen fluoride in aqueous solution.<\/p>\n<p>(iii) The basic character among the hydrides of Group 15 elements decreases with increasing atomic numbers.<\/p>\n<p>(b) Draw the structural formula for <img decoding=\"async\" style=\"height: 24px; width: 52px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2007_03\/image044.png\" \/>\u00a0<strong>[2, 3]<\/strong><\/p>\n<p><strong>27.<\/strong> (a) Name the three major classes of carbohydrates and give the distinctive characteristic of each class.<\/p>\n<p>(b) What are nucleotides? Name two classes of nitrogen containing bases found amongst nucleotides. <strong>[3, 2]<\/strong><\/p>\n<p style=\"text-align: center;\">OR<\/p>\n<p>(a) Describe the classification of lipids based on their chemical compositions. Mention the chief chemical characteristic of each class.<\/p>\n<p>(b) Explain the term \u2018mutarotation\u2019. <strong>[3, 2]<\/strong><\/p>\n<\/div>\n<div 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><\/div>\n<div>\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<\/div>\n<h2><span class=\"ez-toc-section\" id=\"Chemistry_Question_Paper_2007\"><\/span>Chemistry Question Paper 2007<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Download class 12 Chemistry question paper with solution from best CBSE App the myCBSEguide. CBSE class 12 Chemistry question paper 2007 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 2007 for class 12 Chemistry have 27 questions with solution.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Previous_Year_Question_Paper_for_class_12_2017_Free_PDF_Download\"><\/span>Previous Year Question Paper for class 12 2017 Free PDF Download<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 2007 class 12 Accountancy, Chemistry, Physics, History, Political Science, Economics, Geography, Computer Science, Home Science, Accountancy, 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<\/div>\n","protected":false},"excerpt":{"rendered":"<p>CBSE Question Paper 2007 class 12 Chemistry\u00a0conducted by Central Board of Secondary Education, New Delhi in the month of March 2007. 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 2007 class 12 Chemistry\" class=\"read-more\" href=\"https:\/\/mycbseguide.com\/blog\/cbse-question-paper-2007-class-12-chemistry\/\" aria-label=\"More on CBSE Question Paper 2007 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":[1346,1014,1432],"tags":[1527,320,1342,80,1566,1631],"class_list":["post-22121","post","type-post","status-publish","format-standard","hentry","category-cbse","category-cbse-question-papers","category-mathematics-cbse-class-12","tag-cbse-question-paper","tag-chemistry","tag-class-12","tag-last-year-papers","tag-previous-question-paper","tag-ten-year-questions-papers"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 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