{"id":37075,"date":"2022-01-17T18:13:16","date_gmt":"2022-01-17T12:43:16","guid":{"rendered":"https:\/\/infinitylearn.com\/surge\/?p=37075"},"modified":"2022-02-08T17:52:03","modified_gmt":"2022-02-08T12:22:03","slug":"cbse-previous-year-question-papers-class-12-chemistry-2015-outside-delhi","status":"publish","type":"post","link":"https:\/\/infinitylearn.com\/surge\/study-materials\/previous-year\/question-papers\/class-12\/chemistry-2015-outside-delhi\/","title":{"rendered":"CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_37 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\">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\" style=\"display: none;\"><label for=\"item\" aria-label=\"Table of Content\"><span style=\"display: flex;align-items: center;width: 35px;height: 30px;justify-content: center;\"><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><\/label><input type=\"checkbox\" id=\"item\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' style='display:block'><ul class='ez-toc-list-level-4'><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/previous-year\/question-papers\/class-12\/chemistry-2015-outside-delhi\/#Time_allowed_3_hours_Maximum_Marks_70\" title=\"Time allowed: 3 hours \nMaximum Marks: 70\">Time allowed: 3 hours \nMaximum Marks: 70<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/previous-year\/question-papers\/class-12\/chemistry-2015-outside-delhi\/#General_Instructions\" title=\"General Instructions\">General Instructions<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/previous-year\/question-papers\/class-12\/chemistry-2015-outside-delhi\/#CBSE_Previous_Year_Question_Papers_Class_12_Chemistry_2015_Outside_Delhi_Set_I\" title=\"CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I\">CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I<\/a><\/li><\/ul><\/nav><\/div>\n<h4><span class=\"ez-toc-section\" id=\"Time_allowed_3_hours_Maximum_Marks_70\"><\/span>Time allowed: 3 hours<br \/>\nMaximum Marks: 70<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<h4><span class=\"ez-toc-section\" id=\"General_Instructions\"><\/span>General Instructions<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<ul>\n<li>All questions are compulsory.<\/li>\n<li>Section A: Questions number 1 to 5 are very short answer questions and carry 1 mark each.<\/li>\n<li>Section B: Questions number 6 to 12 are short answer questions and carry 2 marks each.<\/li>\n<li>Section C: Questions number 13 to 24 are also short answer questions and carry 3 marks each.<\/li>\n<li>Section D: Questions number 25 to 27 are long answer questions and carry 5 marks each.<\/li>\n<li>There is no overall choice. However, an internal choice has been provided in two questions of one mark, two questions of two marks, four questions of three marks and all the three questions of five marks weightage. You have to attempt only one of the choices in such questions<\/li>\n<li>Use of log tables, if necessary. Use of calculators is not allowed.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"CBSE_Previous_Year_Question_Papers_Class_12_Chemistry_2015_Outside_Delhi_Set_I\"><\/span>CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Question 1.<br \/>\nWrite the formulae of any two oxoacids of sulphur. [1]\nAnswer:<br \/>\nOxoacids of sulphur are chemical compounds that contain sulphur, oxygen and hydrogen.<br \/>\nTwo oxoacids of sulphur are:<\/p>\n<ol>\n<li>Peroxodisulfuric acid: H<sub>2<\/sub>S<sub>2<\/sub>O<sub>8<\/sub><\/li>\n<li>Dithionic acid: H<sub>2<\/sub>S<sub>2<\/sub>O<sub>6<\/sub>.<\/li>\n<\/ol>\n<p>Question 2.<br \/>\nWrite the IUPAC name of the given compound: [1]\n<img loading=\"lazy\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48550510751_9b350ff35e_o.png\" alt=\"CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I Q2\" width=\"316\" height=\"76\" \/><br \/>\nAnswer:<br \/>\nEthoxy-2-methyl propane.<\/p>\n<p>Question 3.<br \/>\nA delta is formed at the meeting point of seawater and river water. Why? [1]\nAnswer:<br \/>\nRiver water is the negatively charged colloidal solution whereas seawater contains a number of electrolytes the meeting point of seawater and river water, the electrolytes present in seawater coagulate the colloidal solution of clay resulting in its deposition with the formation of the delta.<\/p>\n<p>Question 4.<br \/>\nWhich would undergo S<sub>N<\/sub>1 reactions faster in the following pair: [1]\n<img loading=\"lazy\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48550654807_4b431649d6_o.png\" alt=\"CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I Q4\" width=\"382\" height=\"74\" \/><br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48550654847_edd3000004_o.png\" alt=\"CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I Q4.1\" width=\"392\" height=\"303\" \/><\/p>\n<p>Question 5.<br \/>\nWhat is the formula of a compound in which the element Y forms ccp lattice and atoms of X occupy 273rd of tetrahedral voids? [1]\n<p>Question 6.<br \/>\nWrite one similarity and one difference between the chemistry of lanthanides and that of actinides. [2]\nAnswer:<br \/>\nSimilarity<\/p>\n<ol>\n<li>Both involve the filling of f-orbital (i.e. 4f and 5f)<\/li>\n<li>Both show contraction i.e. Lanthanide contraction and actinoid contraction.<\/li>\n<\/ol>\n<p>Differences between lanthanoids and actinoids<\/p>\n<table border=\"2\">\n<tbody>\n<tr>\n<td style=\"text-align: center\" width=\"48\"><strong>S.No.<\/strong><\/td>\n<td style=\"text-align: center\" width=\"210\"><b>Lanthanides<\/b><\/td>\n<td style=\"text-align: center\" width=\"168\"><strong>Actinoids<\/strong><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\" width=\"48\">1.<\/td>\n<td width=\"210\">Except for Pm (promethium), all lanthanides are non-radioactive.<\/td>\n<td width=\"168\">Actinides are radioactive.<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\" width=\"48\">2.<\/td>\n<td width=\"210\">Lathanoids do not show a wide range of oxidation state.<\/td>\n<td width=\"168\">Actinides shows a wide range of oxidation state.<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\" width=\"48\">3.<\/td>\n<td width=\"210\">Lanthanoids ions are generally coloured.<\/td>\n<td width=\"168\">Actinoid ions are colourless<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Question 7.<\/p>\n<ol>\n<li>Write down the IUPAC name of the following complex: [CO(NH<sub>3<\/sub>)<sub>5<\/sub>Cl]<sup>2+<\/sup><\/li>\n<li>Write the formula for the following complex: Potassium tetrachloronickelate (II). [2]<\/li>\n<\/ol>\n<p>Answer:<\/p>\n<ol>\n<li>[CO(NH<sub>3<\/sub>)<sub>5<\/sub>Cl]<sub>2<\/sub>: Pentaamminechlorocobalt (III) ion<\/li>\n<li>Potassium tetrachloronickelate(II): K<sub>2<\/sub>[NiCl<sub>4<\/sub>]<\/li>\n<\/ol>\n<p>Question 8.<br \/>\nWrite the reagents required in the following reactions:<br \/>\n<img loading=\"lazy\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48550654892_2d3c9ce6f2_o.png\" alt=\"CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I Q8\" width=\"374\" height=\"65\" \/><br \/>\nOR<br \/>\nArrange the following compounds in increasing order of their property as indicated:<br \/>\n(i) CH<sub>3<\/sub>COCH<sub>3<\/sub>, C<sub>6<\/sub>H<sub>5<\/sub>COCH<sub>3<\/sub>, CH<sub>3<\/sub>CHO (reactivity towards nucleophilic addition reaction)<br \/>\n(ii) Cl-CH<sub>2<\/sub>-COOH, F-CH<sub>2<\/sub>-COOH, CH<sub>3<\/sub>-COOH (acidic character).<br \/>\n<img loading=\"lazy\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48550510996_d55e2b8d00_o.png\" alt=\"CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I Q8.1\" width=\"277\" height=\"125\" \/><br \/>\nAnswer:<br \/>\n(i) CH<sub>2<\/sub>=CH-CH<sub>2<\/sub>OH<br \/>\n<img loading=\"lazy\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48550511121_0b26f81e4d_o.png\" alt=\"CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I Q8.2\" width=\"401\" height=\"328\" \/><br \/>\nNucleophiles are negatively charged entity, the positivity of carbon in the carbonyl group facilitates nucleophilic addition. Thus positivity of carbon in carbonyl group is in order HI &gt; I &gt; II. Due to +1 effect of -CH<sub>3<\/sub> group and benzene ring \u03c0-cloud, the positivity of carbonyl carbon is decreased so much than (I) and (II). Thus nucleophilic addition order III &gt; I &gt; II.<br \/>\n<img loading=\"lazy\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48550511176_3f4206eba5_o.png\" alt=\"CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I Q8.3\" width=\"373\" height=\"290\" \/><br \/>\nThe stability order II &gt; I &gt; III. Due to +1 effect of -CH<sub>3<\/sub> group electron density of oxygen is more. But in (I) and (II), -I effect of -F is more than -Cl. Thus II is more stabilized than I. Thus acidity order is II &gt; I &gt; III.<\/p>\n<p>Question 9.<\/p>\n<ol>\n<li>On mixing liquid X and liquid Y, the volume of the resulting solution decreases. What type of deviation from Raoult\u2019s law is shown by the resulting solution? What change in temperature would you observe after mixing liquids X and Y?<\/li>\n<li>What happens when we place the blood cell in water (hypotonic solution)? Give reason. [2]<\/li>\n<\/ol>\n<p>Answer:<\/p>\n<ol>\n<li>Negative deviation of Raoult\u2019s law occurred. There is an elevation of boiling point i.e., the temperature of the solution increases.<\/li>\n<li>When a blood cell is placed in water (hypotonic solution), water penetrate to blood cell and blood cell gets bulged and then disrupt.<\/li>\n<\/ol>\n<p>Question 10.<br \/>\nCalculate the time to deposit 1.27 g of copper at cathode when a current of 2A was passed through the solution of CuSO<sub>4<\/sub>.<br \/>\n(Molar mass of Cu = 63.5 g mol<sup>-1<\/sup>, 1F = 96500 C mol<sup>-1<\/sup>). [2]\nAnswer:<br \/>\nCu<sup>2+<\/sup> + 2e<sup>\u2013<\/sup> \u2192 Cu<br \/>\n63.5 g of copper deposited by 2 \u00d7 96500 C<br \/>\n1.27 g of copper will be deposited by<br \/>\n<img loading=\"lazy\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48550511211_79a9f7c545_o.png\" alt=\"CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I Q10\" width=\"317\" height=\"140\" \/><\/p>\n<p>Question 11.<br \/>\nA solution is prepared by dissolving 10 g of non-volatile solute in 200 g of water. It has a vapour pressure of 31.84 mm Hg at 308 K. Calculate the molar mass of the solute. (Vapour pressure of pure water at 308 K = 32 mm Hg). [3]\nAnswer:<br \/>\nAccording to Raoult\u2019s law,<br \/>\n<img loading=\"lazy\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48550511366_4aa3934bc9_o.png\" alt=\"CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I Q11\" width=\"137\" height=\"51\" \/><br \/>\nWhere<br \/>\nP<sup>0<\/sup> \u2192 Vapour pressure of pure water<br \/>\nP \u2192 Vapour pressure of the solution<br \/>\nw \u2192 Weight of solute<br \/>\nm \u2192 Molecular weight of solute<br \/>\nW \u2192 Weight of solvent<br \/>\nM \u2192 Molecular weight of solvent<br \/>\n<img loading=\"lazy\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48550655387_bc91840930_o.png\" alt=\"CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I Q11.1\" width=\"231\" height=\"55\" \/><br \/>\nor, 0.005 m = 0.9 or, m = 180.<br \/>\nThus the molar mass of the solute 180 gm.\/mol<\/p>\n<p>Question 12.<br \/>\n(i) Name the method of refining to obtain silicon of high purity.<br \/>\n(ii) What is the role of SiO<sub>2<\/sub> in the extraction of copper?<br \/>\n(iii) What is the role of depressants in froth floatation process? [3]\nAnswer:<br \/>\n(i) Zone refining is the method of refining to obtain silicon of high purity.<\/p>\n<p>(ii) SiO<sub>2<\/sub> combined with the iron in the copper ore to form iron(II) silicate slag which is easily removed. Thus it (SiO<sub>2<\/sub>) acts as a flux to remove the impurity of Iron oxide.<br \/>\n<img loading=\"lazy\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48550511516_b40548acae_o.png\" alt=\"CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I Q12\" width=\"199\" height=\"48\" \/><\/p>\n<p>(iii) In the froth flotation process, depressant prevents the formation of froth. It is used to separate two sulphide ore by preventing the formation of froth of one sulphide ore and allowing the other to form the froth e.g., NaCN a depressant selectively prevents ZnS from coming in froth but allows PbS to come with the froth.<\/p>\n<p>Question 13.<br \/>\n(i) Which one of the following is a polysaccharide:<br \/>\nStarch, maltose, fructose, glucose.<br \/>\n(ii) Write one difference between \u03b1-helix and \u03b2-pleated sheet structures of the protein.<br \/>\n(iii) Write the name of the disease caused by the deficiency of vitamin B<sub>12<\/sub>. [3]\nAnswer:<br \/>\n(i) Starch is a polysaccharide.<br \/>\n(ii)<\/p>\n<table border=\"2\">\n<tbody>\n<tr>\n<td style=\"text-align: center\" width=\"30\"><strong>S.No.<\/strong><\/td>\n<td style=\"text-align: center\" width=\"140\"><strong>\u03b1-helix<\/strong><\/td>\n<td style=\"text-align: center\" width=\"134\"><strong>\u03b2-pleated<\/strong><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\" width=\"30\">1.<\/td>\n<td width=\"140\">It is a rod-like structure.<\/td>\n<td width=\"134\">It is a sheet-like structure.<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\" width=\"30\">2.<\/td>\n<td width=\"140\">It is stabilized by intra\u00admolecular hydrogen bonding.<\/td>\n<td width=\"134\">It is stabilized by intermolecular hydro\u00adgen bonding.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>(iii) Pernicious Anaemia caused by the deficiency of Vitamin B<sub>12<\/sub>.<\/p>\n<p>Question 14.<br \/>\n(i) What type of isomerism is shown by the complex [Cr(H<sub>2<\/sub>O)<sub>6<\/sub>] Cl<sub>3<\/sub>?<br \/>\n(ii) On the basis of crystal field theory, write the electronic configuration for d<sup>4<\/sup> ion if \u0394<sub>0<\/sub> &gt; P.<br \/>\n(iii) Write the hybridization and shape of [CoF<sub>6<\/sub>]<sup>3-<\/sup>.<br \/>\n(Atomic number of Co = 27). [3]\nAnswer:<br \/>\n(i) Hydration isomerism is shown by the complex [Cr(H<sub>2<\/sub>O)<sub>6<\/sub>] Cl<sub>3<\/sub>.<br \/>\n[Cr(H<sub>2<\/sub>O)<sub>5<\/sub> Cl] Cl<sub>2<\/sub> (H<sub>2<\/sub>O); [Cr(H<sub>2<\/sub>O)<sub>3<\/sub> Cl<sub>3<\/sub>] 3(H<sub>2<\/sub>O).<br \/>\n(ii) Since \u0394<sub>0<\/sub> &gt; P it is on splitting t<sup>4<\/sup><sub>2g<\/sub> e<sub>g<\/sub><sup>0<\/sup><br \/>\n(iii) [CoF<sub>6<\/sub>]<sup>3-<\/sup>: sp<sup>3<\/sup>d<sup>2<\/sup> hybridisation and the shape is octahedral.<br \/>\n<img loading=\"lazy\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48550511621_6141664e47_o.png\" alt=\"CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I Q14\" width=\"374\" height=\"67\" \/><br \/>\n[CoF<sub>6<\/sub>]<sup>3-<\/sup> has four unpaired electrons. thus it is paramagnetic.<\/p>\n<p>Question 15.<br \/>\nHow can the following conversion be carried out:<br \/>\n(i) Aniline to bromobenzene<br \/>\n(ii) Chlorobenzene to 2-chloroacetophenone<br \/>\n(iii) Chloroethane to butane. [3]\nOR<br \/>\nWhat happens when<br \/>\n(i) Chlorobenzene is treated with Cl<sub>2<\/sub>\/FeCl<sub>3<\/sub><br \/>\n(ii) Ethyl chloride is treated with AgNO<sub>2<\/sub><br \/>\n(iii) 2-Bromopentane is treated with alcoholic KOH?<br \/>\nWrite the chemical equations in support of your answer.<br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48550655642_58a60efa86_o.png\" alt=\"CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I Q15\" width=\"381\" height=\"453\" \/><br \/>\n<img loading=\"lazy\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48550655687_2fbe0878a5_o.png\" alt=\"CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I Q15.1\" width=\"346\" height=\"311\" \/><br \/>\n<img loading=\"lazy\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48550511836_7b3a39485c_o.png\" alt=\"CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I Q15.2\" width=\"389\" height=\"184\" \/><\/p>\n<p>Question 16.<br \/>\nExamine the given defective crystal:<br \/>\n<img loading=\"lazy\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48550511926_594d79505f_o.png\" alt=\"CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I Q16\" width=\"229\" height=\"134\" \/><br \/>\nAnswer the following questions:<br \/>\n(i) Is the above defect stoichiometric or non- stoichiometric?<br \/>\n(ii) Write the term used for this type of defect. Give an example of the compound which shows this type of defect.<br \/>\n(iii) How does this defect affect the density of the crystal? [3]\n<p>Question 17.<br \/>\nThe conductivity of 2.5 \u00d7 10<sup>-4<\/sup> M methanoic acid is 5.25 \u00d7 10<sup>-5<\/sup> S cm<sup>-1<\/sup>. Calculate its molar conductivity and degree of dissociation.<br \/>\nGiven: \u03bb(H<sup>+<\/sup>) = 349.5 S cm<sup>2<\/sup> mol<sup>-1<\/sup> and \u03bb<sup>0<\/sup>(HCOO<sup>\u2013<\/sup>) = 50.5 S cm<sup>2<\/sup> mol<sup>-1<\/sup>. [3]\nAnswer:<br \/>\nWe know molar conductivity<br \/>\n<img loading=\"lazy\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48550655897_3487f8150e_o.png\" alt=\"CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I Q17\" width=\"372\" height=\"272\" \/><\/p>\n<p>Question 18.<br \/>\nWrite any three differences between Physisorption and Chemisorption. [3]\nAnswer:<\/p>\n<table border=\"2\">\n<tbody>\n<tr>\n<td style=\"text-align: center\" width=\"48\"><strong>S.No.<\/strong><\/td>\n<td style=\"text-align: center\" width=\"210\"><strong>Physisorption<\/strong><\/td>\n<td style=\"text-align: center\" width=\"174\"><strong>Chemisorption<\/strong><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\" width=\"48\">1.<\/td>\n<td width=\"210\">It forms multimolecular layers<\/td>\n<td width=\"174\">It forms unimolecular layers<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\" width=\"48\">2.<\/td>\n<td width=\"210\">It is reversible<\/td>\n<td width=\"174\">It is irreversible<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\" width=\"48\">3.<\/td>\n<td width=\"210\">Its does not require activation energy<\/td>\n<td width=\"174\">It requires activation energy<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\" width=\"48\">4.<\/td>\n<td width=\"210\">It is not very specific<\/td>\n<td width=\"174\">It is very specific<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\" width=\"48\">5.<\/td>\n<td width=\"210\">Force of attraction is Van Der Waals forces<\/td>\n<td width=\"174\">Force of attraction is a chemical bond<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Question 19.<br \/>\nGive reasons for the following:<br \/>\n(i) Phenol is more acidic than methanol.<br \/>\n(ii) The C \u2013 O \u2013 H bond angle in alcohols is slightly less than the tetrahedral angle (109<sup>0<\/sup>28\u2032).<br \/>\n(iii) (CH<sub>3<\/sub>)<sub>3<\/sub>C \u2013 O \u2013 CH<sub>3<\/sub> on reaction with HI gives (CH<sub>3<\/sub>)<sub>3<\/sub>C \u2013 I and CH<sub>3<\/sub> \u2013 OH as the main products and not (CH<sub>3<\/sub>)<sub>3<\/sub>C \u2013 OH and CH<sub>3<\/sub> \u2013 I. [3]\nAnswer:<br \/>\n(i) Phenoxide ion is more stabilized than CH<sub>3<\/sub> \u2013 O- ion because of resonance:<br \/>\n<img loading=\"lazy\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48550512046_d6669b91d9_o.png\" alt=\"CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I Q19\" width=\"403\" height=\"112\" \/><br \/>\nThus phenol is more acidic than CH<sub>3<\/sub> \u2013 OH.<\/p>\n<p>(ii) Due to the presence of lone pair on oxygen which causes repulsion, the bond angle in alcohol is slightly less than tetrahedral angle (109<sup>0<\/sup>28\u2032).<\/p>\n<p>(iii) Since (CH<sub>3<\/sub>)<sub>3<\/sub> C<sup>+<\/sup> is more stabilized through +I effect of three methyl group thus (CH<sub>3<\/sub>)<sub>3<\/sub> C \u2013 I and CH<sub>3<\/sub> \u2013 OH formed on the treatment of HI with (CH<sub>3<\/sub>)<sub>3<\/sub>C-O-CH<sub>3<\/sub>.<br \/>\n<img loading=\"lazy\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48550656037_804c798311_o.png\" alt=\"CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I Q19.1\" width=\"397\" height=\"71\" \/><\/p>\n<p>Question 20.<br \/>\nPredict the products of the following reactions: [3]\n<img loading=\"lazy\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48550512091_3ee55dae03_o.png\" alt=\"CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I Q20\" width=\"303\" height=\"212\" \/><br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48550656057_cb2a8a4763_o.png\" alt=\"CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I Q20.1\" width=\"402\" height=\"365\" \/><\/p>\n<p>Question 21.<br \/>\n(a) Account for the following:<br \/>\n(i) Cu<sup>+<\/sup> is unstable in an aqueous solution.<br \/>\n(ii) Transition metals form complex compounds.<br \/>\n(b) Complete the following equation:<br \/>\nCr<sub>2<\/sub>Cr2O7<sup>\u2013<\/sup> + 8H<sup>+<\/sup> + 3NO<sup>\u2013<\/sup><sub>2<\/sub> \u2192 [3]\nAnswer:<br \/>\n(a) (i) 2Cu<sup>+<\/sup>(aq) \u2192 Cu<sup>2+<\/sup>(aq) + Cu(s)<br \/>\nThe higher stability of Cu<sup>2+<\/sup> ion in aqueous solution is due to its greater negative charge than Cu. It compensates the second ionisation enthalpy of Cu involved in the formation of Cu<sup>2+<\/sup> ions.<\/p>\n<p>(ii) Since transition metals have unfilled or partially filled d-orbital thus to satisfy its octane forms complex compounds.<br \/>\n<img loading=\"lazy\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48550656132_d56deb9600_o.png\" alt=\"CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I Q21\" width=\"377\" height=\"111\" \/><\/p>\n<p>Question 22.<br \/>\nWrite the names and structures of the monomers of the following polymers:<br \/>\n(i) Terylene<br \/>\n(ii) Buna-S<br \/>\n(iii) Neoprene [3]\nAnswer:<br \/>\n<img loading=\"lazy\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48550512181_7c9f2b5bf8_o.png\" alt=\"CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I Q22\" width=\"374\" height=\"150\" \/><br \/>\n<img loading=\"lazy\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48550512206_95614b394a_o.png\" alt=\"CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I Q22.1\" width=\"182\" height=\"105\" \/><\/p>\n<p>Question 23.<br \/>\nSeeing the growing cases of diabetes and depression among young children, Mr Chopra, the principal of one reputed school organized a seminar in which he invited parents and principals. They all resolved this issue by strictly banning junk food in schools and introducing healthy snacks and drinks like soup, lassi, milk, etc. in school canteens. They also decided to make compulsory half an hour of daily physical activities for the students in the morning assembly. After six months, Mr Chopra conducted the health survey in most of the schools and discovered a tremendous improvement in the health of the students.<\/p>\n<p>After reading the above passage, answer the following questions:<br \/>\n(i) What are the values (at least two) displayed by Mr Chopra?<br \/>\n(ii) As a student, how can you spread awareness about this issue?<br \/>\n(iii) Why should antidepressant drugs not be taken without consulting a doctor?<br \/>\n(iv) Give two examples of artificial sweeteners. [4]\nAnswer:<br \/>\n(ii) Awareness can be spread by performing nukkad Natak in community, displaying posters, cartoons and slogans and by conducting seminars.<\/p>\n<p>(iii) Antidepressant drugs have lots of side effects like indigestion, headache, stomach aches, drowsiness, weight gain. That is why it should not be taken without consulting with doctors.<\/p>\n<p>(iv) Example of artificial sweeteners is Aspartame, Saccharin, Sucralose etc.<\/p>\n<p>Question 24.<br \/>\n(a) Account for the following:<br \/>\n(i) Acidic character increases from HF to HI.<br \/>\n(ii) There is a large difference between the melting and boiling points of oxygen and sulphur.<br \/>\n(iii) Nitrogen does not form pentahalide.<br \/>\n(b) Draw the structures of the following:<br \/>\n(i) ClF<sub>3<\/sub><br \/>\n(ii) XeF<sub>4<\/sub> [5]\nOR<br \/>\n(i) Which allotrope of phosphorus is reactive and why?<br \/>\n(ii) How are the supersonic jet aeroplanes responsible for the depletion of the ozone layer?<br \/>\n(iii) F<sub>2<\/sub> has a lower bond dissociation enthalpy than Cl<sub>2<\/sub>. Why?<br \/>\n(iv) Which noble gas is used in filling balloons for meteorological observations?<br \/>\n(v) Complete the following equation:<br \/>\nXeF<sub>2<\/sub> + PF<sub>5<\/sub> \u2192 [5]\nAnswer:<br \/>\n(a) (i) Size of halide ions is of the order<br \/>\nF<sup>\u2013<\/sup> &lt; Cl<sup>\u2013<\/sup> &lt; Br<sup>\u2013<\/sup> &lt; I<sup>\u2013<\/sup> with increase in size negative charge is dispersed throughout ions and ions gets stabilized. Thus acidity order<br \/>\nHF &lt; HCl &lt; HBr &lt; HI.<\/p>\n<p>(ii) Due to the presence of vacant d-orbital and combining forms of sulphur (S<sub>8<\/sub>) which is not present in oxygen, the cohesive energy of sulphur is more than oxygen leading to large melting point and boiling point.<br \/>\n<img loading=\"lazy\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48550656182_e6c07a6f71_o.png\" alt=\"CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I Q24\" width=\"329\" height=\"228\" \/><\/p>\n<p>(ii) The exhaust emitted from supersonic jet aeroplane contains CO<sub>2<\/sub>, NO and other particles which are the killers of stratospheric ozone layer along with the supersonic sound produced by these aeroplanes are destroy the ozone layer.<\/p>\n<p>(iii) Due to the smaller size and high electronegativity of fluorine, more energy is required to break the bond of F<sub>2<\/sub> than Cl<sub>2<\/sub>. Thus F<sub>2<\/sub> has lower bond dissociation energy than Cl<sub>2<\/sub>.<\/p>\n<p>(iv) Helium (He) gas is used in filling balloons for meteorological observations because it is non-inflammable and light gas.<\/p>\n<p>(v) XeF<sub>2<\/sub> + PF<sub>5<\/sub> \u2192 [XeF]<sup>+<\/sup> [PF<sub>6<\/sub> ]<sup>\u2013<\/sup>.<\/p>\n<p>Question 25.<br \/>\nAn aromatic compound \u2018A\u2019 of molecular formula C<sub>7<\/sub>H<sub>6<\/sub>O<sub>2<\/sub> undergoes a series of reactions as shown below. Write the structures of A, B, C, D and E in the following reactions: [5]\n<img loading=\"lazy\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48550510666_e2f1190bdf_o.png\" alt=\"CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I Q25\" width=\"363\" height=\"132\" \/><br \/>\nOR<br \/>\n(a) Write the structures of main products when benzene diazonium chloride reacts with the following reagents:<br \/>\n(i) H<sub>3<\/sub>PO<sub>2 <\/sub>+ H<sub>2<\/sub>O<br \/>\n(ii) CuCN\/KCN<br \/>\n(iii) H<sub>2<\/sub>O<br \/>\n(b) Arrange the following in the increasing order of their basic character in an aqueous solution:<br \/>\nC<sub>2<\/sub>H<sub>5<\/sub>NH<sub>2<\/sub>, (C<sub>2<\/sub>H<sub>5<\/sub>)<sub>2<\/sub>NH, (C<sub>2<\/sub>H<sub>5<\/sub>)<sub>3<\/sub>N<br \/>\n(c) Give a simple chemical test to distinguish between the following pair of compounds:<br \/>\nC<sub>6<\/sub>H<sub>5<\/sub>-NH<sub>2<\/sub> and C<sub>6<\/sub>H<sub>5<\/sub>-NH-CH<sub>3<\/sub> [5]\nAnswer:<br \/>\nA: C<sub>6<\/sub>H<sub>5<\/sub>COOH (Benzoic acid)<br \/>\nB: C<sub>6<\/sub>H<sub>5<\/sub>NH<sub>2<\/sub> (Aniline)<br \/>\nC: C<sub>6<\/sub>H<sub>5<\/sub>NHCOCH<sub>3<\/sub> (N-phenyl ethanamide)<br \/>\nD: C<sub>6<\/sub>H<sub>5<\/sub>CH<sub>2<\/sub>NH<sub>2<\/sub> (Benzylamine)<br \/>\nE: C<sub>6<\/sub>H<sub>4<\/sub>(Br)<sub>3<\/sub> (NH<sub>2<\/sub>) (2,4, 6-Tribromoaniline)<br \/>\nOR<br \/>\n<img loading=\"lazy\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48550656222_8b29827c71_o.png\" alt=\"CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I Q25.1\" width=\"334\" height=\"339\" \/><br \/>\n<img loading=\"lazy\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48550512286_c7d8f78079_o.png\" alt=\"CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I Q25.2\" width=\"336\" height=\"164\" \/><\/p>\n<p>(b) C<sub>2<\/sub>H<sub>5<\/sub>NH<sub>2<\/sub> &lt; (C<sub>2<\/sub>H<sub>5<\/sub>)<sub>3<\/sub>N &lt; (C<sub>2<\/sub>H<sub>5<\/sub>)<sub>2<\/sub>NH<br \/>\n+I effect of three C2Hs group increases the enormous availability of lone pair of nitrogen atom than +I effect of 2 ethyl group.<br \/>\nThus the order of basicity is I &lt; III &lt; II.<\/p>\n<p>(c) C<sub>6<\/sub>H<sub>5<\/sub> \u2013 NH<sub>2<\/sub> (Primary amine) and C<sub>6<\/sub>H<sub>5<\/sub> \u2013 NH \u2013 CH<sub>3<\/sub> (Secondary amine) can be distinguished by Hinsberg\u2019s test. In this test, amines are allowed to react with Hinsberg\u2019s reagent, benzene sulphonyl chloride (C<sub>6<\/sub>H<sub>5<\/sub>SO<sub>2<\/sub>Cl). Primary amines react with this reagent to form N-alkyl benzene sulfonyl amide which is soluble in alkali but secondary amines give sulphonamide which is insoluble in alkali.<\/p>\n<p>Question 26.<br \/>\nFor the hydrolysis of methyl acetate in aqueous solution, the following results were obtained:<br \/>\n<img loading=\"lazy\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48550510406_044963b27b_o.png\" alt=\"CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I Q26\" width=\"404\" height=\"92\" \/><br \/>\n(a) Show that it follows pseudo-first-order reaction, as the concentration of water remains constant.<br \/>\n(b) Calculate the average rate of reaction between the time interval 10 to 20 seconds.<br \/>\n(Given: log 2 = 0.3010, log 4 = 0.6021). [5]\nOR<br \/>\n(a) For a reaction A + B \u2192 P, the rate is given by Rate = k[A][B]<sup>2<\/sup><br \/>\n(i) How is the rate of reaction affected if the concentration of B is doubled?<br \/>\n(ii) What is the overall order of reaction if A is present in large excess?<br \/>\n(b) A first-order reaction takes 30 minutes for 50% completion. Calculate the time required for 90% completion of this reaction.<br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48550510641_b43562e88b_o.png\" alt=\"CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I Q26.1\" width=\"261\" height=\"106\" \/><br \/>\n<img loading=\"lazy\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48550510581_65b3442b53_o.png\" alt=\"CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I Q26.2\" width=\"372\" height=\"388\" \/><br \/>\nOR<br \/>\n(a) (i) Since the given reaction has order two with respect to reactant B, thus if the concentration of B is doubled in the given reaction, then the rate of reaction will become four times.<\/p>\n<p>(ii) It the concentration of B is doubled i.e.; [B]<sup>2<\/sup> the overall reaction will be two, because if A is present in large excess, then the reaction will be independent of the concentration of A and will be dependent only on the concentration of B.<br \/>\nOrder of reaction = 2.<br \/>\n<img loading=\"lazy\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48550510481_ef93b2b0ac_o.png\" alt=\"CBSE Previous Year Question Papers Class 12 Chemistry 2015 Outside Delhi Set I Q26.3\" width=\"368\" height=\"362\" \/><\/p>\n<p><strong>Note:<\/strong> All questions are same in Outside Delhi Set II and III.<\/p>\n<h4><\/h4>\n","protected":false},"excerpt":{"rendered":"<p>Time allowed: 3 hours Maximum Marks: 70 General Instructions All questions are compulsory. 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