{"id":17647,"date":"2022-01-25T12:06:25","date_gmt":"2022-01-25T06:36:25","guid":{"rendered":"https:\/\/infinitylearn.com\/surge\/?p=17647"},"modified":"2024-10-08T12:09:43","modified_gmt":"2024-10-08T06:39:43","slug":"jee-main-chemistry-jee-main-previous-year-papers-questions-with-solutions-chemistry-thermodynamics-and-chemical-energitics","status":"publish","type":"post","link":"https:\/\/infinitylearn.com\/surge\/jee-main\/chemistry\/jee-main-previous-year-papers-questions-with-solutions-chemistry-thermodynamics-and-chemical-energitics\/","title":{"rendered":"Thermodynamics and Chemical Energitics- JEE Main MCQ&#8217;S &#038; Solutions in Chemistry"},"content":{"rendered":"<h2>Thermodynamics and Chemical Energitics- JEE Main MCQ&#8217;S &amp; Solutions in Chemistry<\/h2>\n<p><strong>1.A heat engine absorbs heat Q, at temperature T, and heat Q<sub>2<\/sub> at temperature T<sub>r<\/sub> Work done by the engine is J(Q, + Q<sub>2<\/sub>). This data (2002)<\/strong><br \/>\n<strong> (1)violates 1<sup>st<\/sup> law of thermodynamics<\/strong><br \/>\n<strong> (2)violates I<sup>s<\/sup>\u2018 law of thermodynamics if Q, is -ve<\/strong><br \/>\n<strong> (3)violates 1<sup>st<\/sup> law of thermodynamics if Q<sub>2<\/sub> is -ve<\/strong><br \/>\n<strong> (4)does not violates I<sup>s<\/sup>\u2018 law of thermodynamics<\/strong><br \/>\n<strong>Ans.<\/strong>(1) Some mechanical energy is always converted (lost) to other forms of energy.<\/p>\n<p><strong>2.If an endothermic reaction is non-spontaneous at freezing point of water and becomes feasible at its boiling point, then (2002)<\/strong><br \/>\n<strong> (1)A H is \u2013 ve, A S is + ve<\/strong><br \/>\n<strong> (2)AH and AS both are + ve<\/strong><br \/>\n<strong> (3)AH and AS both are \u2013 ve<\/strong><br \/>\n<strong> (4)AH is + ve, AS is \u2013 ve<\/strong><br \/>\n<strong>  Ans.<\/strong>(2) At low temperature the AS is -ve which makes AG positive (AG = AH-TAS). But at higher temperature AS is +ve which makes the AG negative (condition for spontaneity).<\/p>\n<p><img loading=\"lazy\" class=\"aligncenter\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25393214353_c9a347bf3b_o.png\" alt=\"jee-main-previous-year-papers-questions-with-solutions-chemistry-thermodynamics-and-chemical-energitics-3\" width=\"382\" height=\"159\" \/><br \/>\n<strong> Ans.<\/strong>(4) AH negative shows that the reaction is spontaneous. Higher value for Zn shows that the reaction is more feasible.<\/p>\n<p><img loading=\"lazy\" class=\"aligncenter\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25927503981_9496b2970f_o.png\" alt=\"jee-main-previous-year-papers-questions-with-solutions-chemistry-thermodynamics-and-chemical-energitics-4\" width=\"371\" height=\"178\" \/><br \/>\n<strong> Ans.<\/strong><br \/>\n<img loading=\"lazy\" class=\"aligncenter\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25394157333_e81fa560c5_o.png\" alt=\"jee-main-previous-year-papers-questions-with-solutions-chemistry-thermodynamics-and-chemical-energitics-4\" width=\"398\" height=\"145\" \/><\/p>\n<p><img loading=\"lazy\" class=\"aligncenter\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25901559212_107f6730cd_o.png\" alt=\"jee-main-previous-year-papers-questions-with-solutions-chemistry-thermodynamics-and-chemical-energitics-5\" width=\"381\" height=\"213\" \/><br \/>\n<strong> Ans.<\/strong>(1) For spontaneous reaction, dS &gt; 0. AG and dG should be negative, i.e. &lt; 0<\/p>\n<p><img loading=\"lazy\" class=\"aligncenter\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25393492913_a42eb88d0a_o.png\" alt=\"jee-main-previous-year-papers-questions-with-solutions-chemistry-thermodynamics-and-chemical-energitics-6\" width=\"365\" height=\"114\" \/><br \/>\n<strong> Ans.<\/strong>(3) AG=-2.303 RT logK .<\/p>\n<div class=\"card\" style=\"text-align: center;\"><a class=\"btn btn-primary\" href=\"https:\/\/infinitylearn.com\/test-series\/jee-12-aits?utm_source=surge&amp;utm_medium=Org&amp;utm_campaign=AITS\"><br \/>\n<img loading=\"lazy\" class=\" lazyloaded\" style=\"width: 100%; border-radius: 10px;\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2024\/10\/class-12-jee-test-series.jpg\" alt=\"class 12 jee test series\" width=\"1201\" height=\"636\" data-src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2024\/10\/class-12-jee-test-series.jpg\" \/><\/a><a class=\"btn btn-primary\" href=\"https:\/\/infinitylearn.com\/test-series\/jee-12-aits?utm_source=surge&amp;utm_medium=Org&amp;utm_campaign=AITS\"><button><strong>All India Test Series for Class 12 JEE Main &amp; Advanced 2025<\/strong><\/button><\/a><\/p>\n<div style=\"text-align: center;\">Boost Your Preparation With Our All India Test Series for Class 12 JEE Main &amp; Advanced 2025<\/div>\n<\/div>\n<p><strong>7.The enthalpy change for a reaction does not depend upon                                          (2003)<\/strong><br \/>\n<strong>(1)use of different reactants for the same product<\/strong><br \/>\n<strong>(2)the nature of intermediate reaction steps<\/strong><br \/>\n<strong>(3)the differences in initial or final temperature of involved substances<\/strong><br \/>\n<strong>(4)the physical states of reactants and products<\/strong><br \/>\n<strong>Ans.<\/strong>(2) Hess law of heat summation.<\/p>\n<p><strong style=\"line-height: 1.5;\">8.The enthalpies of combustion of carbon and carbon monoxide are -393.5 and -283 kj mol*<sup>1 <\/sup>respectively. The enthalpy of formation of carbon monoxide per mole is           (2004)<\/strong><br \/>\n<strong>(1)5 kJ                            2)-110.5 kJ<\/strong><br \/>\n<strong>3) -676.5 kJ                   4) 676.5 kJ<\/strong><br \/>\n<strong>Ans.<\/strong><br \/>\n<img loading=\"lazy\" class=\"aligncenter\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25928906451_d6a1c0b94f_o.png\" alt=\"jee-main-previous-year-papers-questions-with-solutions-chemistry-thermodynamics-and-chemical-energitics-8\" width=\"341\" height=\"88\" \/><\/p>\n<p><img loading=\"lazy\" class=\"aligncenter\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25927809821_4498c16c57_o.png\" alt=\"jee-main-previous-year-papers-questions-with-solutions-chemistry-thermodynamics-and-chemical-energitics-9\" width=\"348\" height=\"103\" \/><br \/>\n<strong> Ans.<\/strong>(1) For a spontaneous change AG is negative and E<sub>ce<\/sub>\u201e is positive.<\/p>\n<p><strong>10.Consider the reaction : N<sub>2<\/sub> + 3H<sub>2<\/sub>\u2014\u2014\u2014 &gt; 2NH<sub>3 <\/sub>carried out at constant temperature and pressure. If AH and AU are the enthalpy and internal energy changes for the reaction, which of the following expressions is true ?<\/strong><br \/>\n<strong>1) AH = 0                      2) AH = AU (2005)<\/strong><br \/>\n<strong>3) AH&lt; AU                     4) AH&gt; AU<\/strong><br \/>\n<strong>Ans.<\/strong><br \/>\n<img loading=\"lazy\" class=\"aligncenter\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25394491313_e6b41a24da_o.png\" alt=\"jee-main-previous-year-papers-questions-with-solutions-chemistry-thermodynamics-and-chemical-energitics-10\" width=\"312\" height=\"73\" \/><\/p>\n<p><img loading=\"lazy\" class=\"aligncenter\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25389892624_44317d66ab_o.png\" alt=\"jee-main-previous-year-papers-questions-with-solutions-chemistry-thermodynamics-and-chemical-energitics-11\" width=\"392\" height=\"267\" \/><br \/>\n<strong> Ans.<\/strong><br \/>\n<img loading=\"lazy\" class=\"aligncenter\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25390607874_d68db64798_o.png\" alt=\"jee-main-previous-year-papers-questions-with-solutions-chemistry-thermodynamics-and-chemical-energitics-11\" width=\"214\" height=\"50\" \/><\/p>\n<p><img loading=\"lazy\" class=\"aligncenter\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25393490453_3c429d406c_o.png\" alt=\"jee-main-previous-year-papers-questions-with-solutions-chemistry-thermodynamics-and-chemical-energitics-12\" width=\"354\" height=\"121\" \/><br \/>\n<strong> Ans.<\/strong>(1) Energy required to get H and C atoms.<\/p>\n<p><img loading=\"lazy\" class=\"aligncenter\" style=\"line-height: 1.5;\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25393676313_636469ce38_o.png\" alt=\"jee-main-previous-year-papers-questions-with-solutions-chemistry-thermodynamics-and-chemical-energitics-13\" width=\"339\" height=\"256\" \/><br \/>\n<strong> Ans.<\/strong><br \/>\n<img loading=\"lazy\" class=\"aligncenter\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25390607854_3affd14215_o.png\" alt=\"jee-main-previous-year-papers-questions-with-solutions-chemistry-thermodynamics-and-chemical-energitics-13\" width=\"372\" height=\"78\" \/><\/p>\n<p><img loading=\"lazy\" class=\"aligncenter\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25928010721_67ce17ea7a_o.png\" alt=\"jee-main-previous-year-papers-questions-with-solutions-chemistry-thermodynamics-and-chemical-energitics-14\" width=\"352\" height=\"229\" \/><br \/>\n<strong> Ans.<\/strong><br \/>\n<img loading=\"lazy\" class=\"aligncenter\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25928536231_c0e55c5d8f_o.png\" alt=\"jee-main-previous-year-papers-questions-with-solutions-chemistry-thermodynamics-and-chemical-energitics-14\" width=\"346\" height=\"269\" \/><\/p>\n<p><img loading=\"lazy\" class=\"aligncenter\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25928009371_33ef19edd1_o.png\" alt=\"jee-main-previous-year-papers-questions-with-solutions-chemistry-thermodynamics-and-chemical-energitics-15\" width=\"352\" height=\"202\" \/><br \/>\n<strong> Ans.<\/strong><br \/>\n<img loading=\"lazy\" class=\"aligncenter\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25928905351_2b7e8f4a93_o.png\" alt=\"jee-main-previous-year-papers-questions-with-solutions-chemistry-thermodynamics-and-chemical-energitics-15\" width=\"324\" height=\"164\" \/><\/p>\n<p><strong style=\"line-height: 1.5;\">16.Identify the correct statement regarding a spontaneous process  (2007)<\/strong><br \/>\n<strong>(1)For a spontaneous process in an isolated system, the change in entropy is positive<\/strong><br \/>\n<strong>(2)Endothermic processes are never spontaneous<\/strong><br \/>\n<strong>(3)Exothermic processes are always spontaneous <strong>(4)Lowering of energy in the reaction process is the only criterion for spontaneity<\/strong><br \/>\n<strong>Ans.<\/strong><\/strong>(1) For a spontaneous process in an isolated sys\u00adtem, the change in entropy is positive.<\/p>\n<p><img loading=\"lazy\" class=\"aligncenter\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25722191670_ffe6999fb5_o.png\" alt=\"jee-main-previous-year-papers-questions-with-solutions-chemistry-thermodynamics-and-chemical-energitics-17\" width=\"361\" height=\"174\" \/><br \/>\n<strong> Ans.<\/strong>(4) We know, AG = AH \u2013 TAS.So, lets find the equilibrium temperature, i.e., at which AG = 0; AH = TAS;<br \/>\n<img loading=\"lazy\" class=\"aligncenter\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25390963994_21fcdbe810_o.png\" alt=\"solutions-chemistry-thermodynamics-and-chemical-energitics-17\" width=\"444\" height=\"117\" \/><\/p>\n<p><img loading=\"lazy\" class=\"aligncenter\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25902057282_6a363d3c37_o.png\" alt=\"jee-main-previous\" width=\"376\" height=\"162\" \/><br \/>\n<strong> Ans.<\/strong><br \/>\n<img loading=\"lazy\" class=\"aligncenter\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25394155213_71b2769c22_o.png\" alt=\"energitics-18\" width=\"365\" height=\"255\" \/><\/p>\n<p><img loading=\"lazy\" class=\"aligncenter\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25928006791_f1368793bf_o.png\" alt=\"chemical-energitics-19\" width=\"348\" height=\"211\" \/><br \/>\n<strong> Ans.<\/strong><br \/>\n<img loading=\"lazy\" class=\"aligncenter\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25390605634_a847a86f1c_o.png\" alt=\"jee-main\" width=\"327\" height=\"211\" \/><br \/>\n<img loading=\"lazy\" class=\"aligncenter\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25723057660_d3c719809e_o.png\" alt=\"jee-main-previous\" width=\"344\" height=\"198\" \/><\/p>\n<p><img loading=\"lazy\" class=\"aligncenter\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25390084814_55be35ea87_o.png\" alt=\" Energitics\" width=\"360\" height=\"211\" \/><br \/>\n<strong> Ans.<\/strong><br \/>\n<img loading=\"lazy\" class=\"aligncenter\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25902942832_bf2ca56dcd_o.png\" alt=\"Thermodynamics \" width=\"357\" height=\"173\" \/><\/p>\n<p><img loading=\"lazy\" class=\"aligncenter\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25393669003_94218b80aa_o.png\" alt=\"energitics-21\" width=\"428\" height=\"179\" \/><br \/>\n<strong> Ans.<\/strong>(2) Enthalpy of formation of NH<sub>3<\/sub>=-46 kJ\/mole  N<sub>2<\/sub> + 3H<sub>2<\/sub>     2NH<sub>3<\/sub> AH<sub>f<\/sub> = -2.x 46kJmol<br \/>\nBond breaking is endothermic and bond formation is exothermic.Assuming \u2018x\u2019 is the bond energy of N-H bond (kJ mol<sup>-1<\/sup>)<br \/>\n712 + (3 x 436) \u2013 6x = -46 x 2 Therefore, x \u2013 352 kJ\/mol<\/p>\n<div class=\"card\" style=\"text-align: center;\"><a class=\"btn btn-primary\" href=\"https:\/\/infinitylearn.com\/online-mock-tests?utm_source=surge&amp;utm_medium=interlinking\"><br \/>\n<img loading=\"lazy\" class=\" lazyloaded\" style=\"width: 100%; border-radius: 10px;\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2024\/09\/cvc.png\" alt=\"online mock test\" width=\"1201\" height=\"636\" data-src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2024\/09\/cvc.png\" \/><\/a><a class=\"btn btn-primary\" href=\"https:\/\/infinitylearn.com\/online-mock-tests?utm_source=surge&amp;utm_medium=interlinking\"><button><strong>Online Mock Test<\/strong><\/button><\/a><\/p>\n<div style=\"text-align: center;\">Boost Your Preparation With Our Free Online Mock Tests For IIT-JEE, NEET And CBSE Exams<\/div>\n<\/div>\n<p><strong>22.For a particular reversible reaction at temperature T, AH and AS were found to be both +ve. If T<sub>e<\/sub> is the temperature at equilibrium, the reaction would be spontaneous when                                 (2010)<\/strong><br \/>\n<strong>1) T &gt; T                        2) T &gt; T<\/strong><br \/>\n<strong>3) T is 5 times T             4) T = T<\/strong><br \/>\n<strong>Ans.<\/strong>(2) AG = AH = TAS at equilibrium, AG = 0 .For a reaction to be spontaneous AG should be negative. Therefore, T &gt; T<\/p>\n<p><strong>23.The entropy change involved in the isothermal reversible expansion of 2 moles of an ideal gas from a volume of 10 dm<sup>3<\/sup> to a volume of 100 dm<sup>3<\/sup> at 27\u00b0C is                                                             (2011)<\/strong><br \/>\n<strong>1) 32.3 J moHK<sup>-1<\/sup> 2) 42.3 J mol-\u2018K\u201d<sup>1<\/sup><\/strong><br \/>\n<strong>3) 38.3 J mol<sup>-1<\/sup>K<sup>-1<\/sup> 4) 35.8 J mol<sup>-1<\/sup>K<sup>_1<\/sup><\/strong><br \/>\n<strong>Ans.<\/strong><br \/>\n<img loading=\"lazy\" class=\"\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25723055620_9ee9ff2853_o.png\" alt=\"jee-main-previous-year-papers-questions-with-solutions-chemistry-thermodynamics-and-chemical-energitics-23\" width=\"233\" height=\"60\" \/><\/p>\n<p><img loading=\"lazy\" class=\"aligncenter\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25390082554_ee70eeb164_o.png\" alt=\"jee-main-previous-year-papers-questions\" width=\"352\" height=\"199\" \/><br \/>\n<strong> Ans.<\/strong><br \/>\n<img loading=\"lazy\" class=\"aligncenter\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25902941322_7284438e8b_o.png\" alt=\"Thermodynamics and Chemical Energitics\" width=\"254\" height=\"129\" \/><br \/>\n<img loading=\"lazy\" class=\"aligncenter\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25928533411_3f2e8992a4_o.png\" alt=\"chemistry-thermodynamics-and-chemical-energitics-24-1\" width=\"260\" height=\"244\" \/><\/p>\n<p><strong>25.A position filled with 0.04 mol of an ideal gas expands reversibly from 50.0 mL to 375 mL at a constant temperature of 37.0<sup>#<\/sup>C. As it does so, it absorbs 208J of heat. The values of q and w for the process will be    (2013)(R = 8.314J\/molK and<\/strong><br \/>\n<strong>In 7.5 = 2.01)<\/strong><br \/>\n<strong>(1)q = + 208J, w = \u2013 208 J<\/strong><br \/>\n<strong>(2)q = \u2013 208J, w = \u2013 208 J<\/strong><br \/>\n<strong>(3)q = \u2013 208J, w = + 208 J<\/strong><br \/>\n<strong>(4)q = + 208J, w = + 208 J<\/strong><br \/>\n<strong>Ans.<\/strong> (1) Work done by system is negative<\/p>\n<p><img loading=\"lazy\" class=\"aligncenter\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25393667143_7ee5025eaf_o.png\" alt=\"jee-main-previous-year\" width=\"387\" height=\"218\" \/><br \/>\n<strong> Ans.<\/strong><br \/>\n<img loading=\"lazy\" class=\"aligncenter\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25722698620_fbb4ce7b36_o.png\" alt=\"thermodynamics-and-chemical-energitics-26\" width=\"284\" height=\"76\" \/><\/p>\n<p><img loading=\"lazy\" class=\"aligncenter\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25902052012_31dfd7d87a_o.png\" alt=\"Thermodynamics and Chemical Energitics\" width=\"355\" height=\"269\" \/><br \/>\n<strong> Ans.<\/strong><br \/>\n<img loading=\"lazy\" class=\"aligncenter\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/25928900921_f6b1978693_o.png\" alt=\"Thermodynamics and Chemical Energitics\" width=\"394\" height=\"196\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Thermodynamics and Chemical Energitics- JEE Main MCQ&#8217;S &amp; Solutions in Chemistry 1.A heat engine absorbs heat Q, at temperature T, [&hellip;]<\/p>\n","protected":false},"author":31,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"Thermodynamics and Chemical Energitics","_yoast_wpseo_title":"Thermodynamics and Chemical Energitics- JEE Main MCQ'S & Solutions","_yoast_wpseo_metadesc":"\"Get Chemistry JEE Main Previous Year Papers with Solutions and MCQ'S in Thermodynamics and Chemical Energitics. 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