{"id":22133,"date":"2018-11-22T11:12:40","date_gmt":"2018-11-22T05:42:40","guid":{"rendered":"http:\/\/mycbseguide.com\/blog\/?p=22133"},"modified":"2018-12-17T14:20:18","modified_gmt":"2018-12-17T08:50:18","slug":"cbse-question-paper-2005-class-12-chemistry","status":"publish","type":"post","link":"https:\/\/mycbseguide.com\/blog\/cbse-question-paper-2005-class-12-chemistry\/","title":{"rendered":"CBSE Question Paper 2005 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-2005-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-2005-class-12-chemistry\/#CBSE_Question_Paper_2005_class_12_Chemistry\" >CBSE Question Paper 2005 class 12 Chemistry<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/mycbseguide.com\/blog\/cbse-question-paper-2005-class-12-chemistry\/#Chemistry_Question_Paper_2008\" >Chemistry Question Paper 2008<\/a><\/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-2005-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 2005 class 12 Chemistry<\/strong>\u00a0conducted by Central Board of Secondary Education, New Delhi in the month of March 2005. 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 2005 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 2005 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_2005_class_12_Chemistry\"><\/span>CBSE Question Paper 2005 class 12 Chemistry<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div>\n<div>\n<p style=\"text-align: left;\"><strong>General Instructions<\/strong><\/p>\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>How many atoms can be assigned to its unit cell if an element forms (i) body centred cubic cell, and (ii) a face centred cubic cell?<strong> [1]<\/strong><\/p>\n<p><strong>2.<\/strong> What would be the value of Van&#8217;t Hoff factor for a dilute solution of K<sub>2<\/sub>SO<sub>4<\/sub> in water?<strong> [1]<\/strong><\/p>\n<p><strong>3. <\/strong>Express the relation between the half-life periodof a reactant and its initial concentration\u00a0for a reaction of n<sup>th <\/sup>order. <strong>[1]<\/strong><\/p>\n<p><strong>4.<\/strong> Mention a chemical property in which methanoic acid differs from acetic acid. <strong>[1]<\/strong><\/p>\n<p><strong>5.<\/strong> How is the basic strength of aromatic amines affected by the presence of an electron releasing group on the benzene ring? <strong>[1]<\/strong><\/p>\n<p><strong>6.<\/strong> State that de Broglie relationship. How do de Broglie waves of a moving particle differ from electromagnetic waves? <strong>[2]<\/strong><\/p>\n<p style=\"text-align: center;\">Or<\/p>\n<p>Show that the uncertainty principle is of little significance for an object of mass <img decoding=\"async\" style=\"height: 40px; width: 210px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image003.png\" \/><\/p>\n<p><strong>7.<\/strong> Predict the products of electrolysis obtained at the electrodes in each case when the electrodes used are of platinum:<strong> [2]<\/strong><\/p>\n<p>(i) An aqueous solution of <img decoding=\"async\" style=\"height: 24px; width: 54px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image004.png\" \/><\/p>\n<p>(ii) An aqueous solution of <img decoding=\"async\" style=\"height: 24px; width: 52px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image005.png\" \/><\/p>\n<p><strong>8.<\/strong> State the basic reason of each of the following statements:<strong> [2]<\/strong><\/p>\n<p>(i) In CI undergoes disproportionate reaction but TICI does not.<\/p>\n<p>(ii) AICI<sub>3<\/sub> acts as a Lewis acid.<\/p>\n<p><strong>9.<\/strong> Write chemical equations for the following reactions:<strong> [2]<\/strong><\/p>\n<p>(i) <img decoding=\"async\" style=\"height: 24px; width: 164px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image006.png\" \/><\/p>\n<p>(ii) <img decoding=\"async\" style=\"height: 24px; width: 101px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image007.png\" \/><\/p>\n<p><strong>10.<\/strong> Identify and mark the presence of centres of chirality\u2019s, if any, in the following molecules.<br \/>\nMention the number of stereoisomer possible in each case.<strong> [2]<\/strong><br \/>\n<img decoding=\"async\" id=\"Picture 1\" style=\"height: 200px; width: 154px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image008.jpg\" \/><\/p>\n<p><strong>11.<\/strong> Explain how an OH group attached to a carbon in the benzene ring activates benzene towards electrophilic substitution. <strong>[2]<\/strong><\/p>\n<p><strong>12.<\/strong> How are polymers classified on the basis of forces operating between their molecules? To which, of these classes does nylon-66 belong?<strong> [2]<\/strong><\/p>\n<p><strong>13. <\/strong>(a) Use the LCAO method for the formation of molecular orbitals in case of homonuclear diatomic hydrogen molecule.<\/p>\n<p>(b) Which of the following has higher bond dissociation energy and why?<\/p>\n<p>(i) <img decoding=\"async\" style=\"height: 22px; width: 29px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image009.png\" \/><\/p>\n<p>(ii) <img decoding=\"async\" style=\"height: 25px; width: 28px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image010.png\" \/><strong>\u00a0[3]<\/strong><\/p>\n<p>Or<\/p>\n<p>What kinds of molecular forces exist between the species in the following pairs of particles and why?<\/p>\n<p>(i) He and N<sub>2<\/sub><\/p>\n<p>(ii) Cl<sub>2<\/sub> and NO<sup>3-<\/sup><\/p>\n<p>(iii) NH<sub>3<\/sub> and CO <strong>[3]<\/strong><\/p>\n<p><strong>14.<\/strong> Aluminum crystallizes in a face centred cubic close-packed structure its atomic radius is <img decoding=\"async\" style=\"height: 24px; width: 87px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image011.png\" \/><\/p>\n<p>(a) What is the length of the edge of the unit cell?<\/p>\n<p>(b) How many such unit cells are there in a 1.00 m piece of aluminium? <strong>[3]<\/strong><\/p>\n<p><strong>15.<\/strong> State Henry&#8217;s law for solubility of a gas in a liquid Explain the significance of Henry&#8217;s law constant ( At the same temperature, hydrogen Is more soluble in water than helium. Which of them will have a higher value of KH and why?<strong> [3]<\/strong><\/p>\n<p><strong>16.<\/strong> The activation energy of a reaction is <img decoding=\"async\" style=\"height: 22px; width: 90px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image012.png\" \/>\u00a0in the absence of a catalyst and <img decoding=\"async\" style=\"height: 24px; width: 97px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image013.png\" \/>\u00a0with a catalyst. How many times will the rate of reaction grow in the presence of the catalyst if the reaction proceeds at <img decoding=\"async\" style=\"height: 24px; width: 196px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image014.png\" \/><strong>\u00a0[3]<\/strong><\/p>\n<p><strong>17.<\/strong> How do size of particles of adsorbent, pressure of gas and prevailing temperature influence the extent of adsorption of a gas on a solid?<strong> [3]<\/strong><\/p>\n<p><strong>I8.<\/strong> (a) Write the structural formula of hex-2-en-4ynoic acid.<\/p>\n<p>(b) To illustrate the following reactions write one chemical equation for each:<\/p>\n<p>(i) Cross aldol condensation<\/p>\n<p>(ii) Hofmann bromamide reaction<strong> [3]<\/strong><\/p>\n<p><strong>19.<\/strong> Write the chemical reaction equation stating the reaction conditions required for each of the following conversions: <strong>[3]<\/strong><\/p>\n<p>(i) Methyl bromide to ethylamine<\/p>\n<p>(ii) Aniline to phenol<\/p>\n<p>(iii) ptoluidine to 2-bromo-4-methylanilline<\/p>\n<p><strong>20.<\/strong> (a) Write the corresponding chemical reaction equation to show that<\/p>\n<p>(i) PbO<sub>2<\/sub> can act as an oxidizing agent.<\/p>\n<p>(ii) All the bonds in a molecule of PCI<sub>5<\/sub> are not equivalent.<\/p>\n<p>(b) Write the structural formula for either XeF<sub>2<\/sub> or IF<sub>3<\/sub>.<strong> [3]<\/strong><\/p>\n<p><strong>21.<\/strong> Draw a sketch to show the splitting of d-orbital in an octahedral crystal field. State clearly\u00a0how the actual configuration in split d-orbital in an octahedral crystal field is decided by the\u00a0magnitudes of <img decoding=\"async\" style=\"height: 24px; width: 20px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image015.png\" \/>\u00a0and P values.<strong> [3]<\/strong><\/p>\n<p><strong>22. <\/strong>The E\u00b0 values at 298 K corresponding to the following two reduction electrode processes are:<\/p>\n<p><img decoding=\"async\" style=\"height: 24px; width: 143px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image016.png\" \/><\/p>\n<p><img decoding=\"async\" style=\"height: 24px; width: 161px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image017.png\" \/><\/p>\n<p>Formulate the galvanic cell for their combination. What will be the cell potential?<\/p>\n<p>Calculate the <img decoding=\"async\" style=\"height: 24px; width: 39px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image018.png\" \/>\u00a0for the cell reaction. <img decoding=\"async\" style=\"height: 24px; width: 140px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image019.png\" \/>\u00a0<strong>[3]<\/strong><\/p>\n<p><strong>23.<\/strong> The radioactive isotope <img decoding=\"async\" style=\"height: 25px; width: 39px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image020.png\" \/>\u00a0can be made by an <img decoding=\"async\" style=\"height: 22px; width: 40px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image021.png\" \/>\u00a0or an <img decoding=\"async\" style=\"height: 22px; width: 39px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image022.png\" \/>\u00a0nuclear reaction. State the appropriate target nucleus for each reaction. If the half-life of <img decoding=\"async\" style=\"height: 25px; width: 28px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image023.png\" \/>\u00a0is 7 years, how long will it take for complete annihilation and why?<strong> [3]<\/strong><\/p>\n<p><strong>24.<\/strong> Describe the following with an example each:<strong> [3]<\/strong><\/p>\n<p>(i) Antimicrobials<\/p>\n<p>(ii) Acid dyes<\/p>\n<p>(iii) Antioxidants<\/p>\n<p><strong>25.<\/strong> (a) The standard Gibbs energy change values <img decoding=\"async\" style=\"height: 24px; width: 49px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image024.png\" \/>\u00a0at 1773 K are given for the following reactions:<\/p>\n<p><img decoding=\"async\" style=\"height: 25px; width: 285px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image025.png\" \/><\/p>\n<p><img decoding=\"async\" style=\"height: 25px; width: 291px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image026.png\" \/><\/p>\n<p><img decoding=\"async\" style=\"height: 25px; width: 265px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image027.png\" \/><\/p>\n<p>Find out the possibility of reducing Fe<sub>2<\/sub>O<sub>3<\/sub> and Al<sub>2<\/sub>O<sub>3<\/sub> with CO at this temperature.<\/p>\n<p>(b) Comment on the following statements giving reasons:<\/p>\n<p>(i) An exothermic reaction is sometimes not spontaneous.<\/p>\n<p>(ii) Reactions with <img decoding=\"async\" style=\"height: 24px; width: 49px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image024.png\" \/>\u00a0values less than zero always have equilibrium constants greater than 1.<strong> [5]<\/strong><\/p>\n<p>Or<\/p>\n<p>(a) The half-reactions are:<\/p>\n<p>(i) <img decoding=\"async\" style=\"height: 24px; width: 195px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image028.png\" \/><\/p>\n<p>(ii) <img decoding=\"async\" style=\"height: 24px; width: 184px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image029.png\" \/><\/p>\n<p>Calculate K<sub>c<\/sub> for the following reaction at <img decoding=\"async\" style=\"height: 19px; width: 44px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image030.png\" \/>:<\/p>\n<p><img decoding=\"async\" style=\"height: 24px; width: 164px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image031.png\" \/><\/p>\n<p>(F=96500 C mol<sup>-1<\/sup>)<\/p>\n<p>(b) Define the following terms:<\/p>\n<p>(i) Isothermal and Adiabatic processes<\/p>\n<p>(ii) State variables \/ State functions <strong>[5]<\/strong><\/p>\n<p><strong>26.<\/strong> (a) Given below are the electrode potential values, <img decoding=\"async\" style=\"height: 17px; width: 23px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image032.png\" \/>\u00a0for some of the first row of transition elements:<\/p>\n<table class=\"mobile\" border=\"1\" cellspacing=\"0\" cellpadding=\"3\">\n<tbody>\n<tr>\n<td style=\"width: 85.8pt;\">Element<\/td>\n<td style=\"width: 43.35pt;\">V(23)<\/td>\n<td style=\"width: 45.6pt;\">Cr(24)<\/td>\n<td style=\"width: 49.1pt;\">Mn(25)<\/td>\n<td style=\"width: 46.15pt;\">Fe(26)<\/td>\n<td style=\"width: 46.9pt;\">Co(27)<\/td>\n<td style=\"width: 45.6pt;\">Ni(28)<\/td>\n<td style=\"width: 46.9pt;\">Cu(29)<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 85.8pt;\"><img decoding=\"async\" style=\"height: 24px; width: 100px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image033.png\" \/><\/td>\n<td style=\"width: 43.35pt;\">-1.18<\/td>\n<td style=\"width: 45.6pt;\">-0.91<\/td>\n<td style=\"width: 49.1pt;\">-1.18<\/td>\n<td style=\"width: 46.15pt;\">-0.44<\/td>\n<td style=\"width: 46.9pt;\">-0.28<\/td>\n<td style=\"width: 45.6pt;\">-0.25<\/td>\n<td style=\"width: 46.9pt;\">+0.34<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Explain the irregularities in these values on the basis of electronic structures of atoms.<\/p>\n<p>(b) Complete the following reaction equations:\u00a0<strong>[5]<\/strong><br \/>\n<img decoding=\"async\" style=\"height: 25px; width: 148px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image034.png\" \/><br \/>\n<img decoding=\"async\" style=\"height: 25px; width: 145px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image035.png\" \/><\/p>\n<p style=\"text-align: center;\">Or<\/p>\n<p>(a) How would you account for the following:<br \/>\n(i) Cobalt (II) is stable in aqueous solution. but in the presence of complexing reagents it is easily oxidized.<br \/>\n(ii) The transition elements exhibit high enthalpy of atomization.<br \/>\n(iii) Of the d<sup>4<\/sup> species, Cr<sup>2+<\/sup> is strongly reducing while Mn (III) is strongly oxidizing.<\/p>\n<p>(b) Name the chief ore of copper and write the reactions Involved in its extraction from that ore. <strong>[5]<\/strong><\/p>\n<p><strong>27.<\/strong> (a) Write the chemical reactions of glucose with (i) <img decoding=\"async\" style=\"height: 24px; width: 60px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image036.png\" \/>\u00a0and (ii) <img decoding=\"async\" style=\"height: 26px; width: 87px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/lyp\/12\/chemistry\/2005_02\/image037.png\" \/>\u00a0Also draw simple Fischer projections of D-glucose and L-glucose.<\/p>\n<p>(b) Name the food sources and the deficiency diseases caused due to lack of any two of vitamins A, C, E and K.<strong> [5]<\/strong><\/p>\n<p style=\"text-align: center;\">Or<\/p>\n<p>(a) State the composition and functional differences between DNA and RNA.<br \/>\nDescribe the mechanism of replication of DNA.<\/p>\n<p>(b) Define &#8216;mutation&#8217;. <strong>[3, 2]<\/strong><\/p>\n<div>\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<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_2008\"><\/span>Chemistry Question Paper 2008<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 2008 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 2008 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_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 2008 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<\/div>\n","protected":false},"excerpt":{"rendered":"<p>CBSE Question Paper 2005 class 12 Chemistry\u00a0conducted by Central Board of Secondary Education, New Delhi in the month of March 2005. 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 2005 class 12 Chemistry\" class=\"read-more\" href=\"https:\/\/mycbseguide.com\/blog\/cbse-question-paper-2005-class-12-chemistry\/\" aria-label=\"More on CBSE Question Paper 2005 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],"class_list":["post-22133","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"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - 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