{"id":40590,"date":"2024-05-02T06:56:44","date_gmt":"2024-05-02T06:56:44","guid":{"rendered":"https:\/\/edukemy.com\/blog\/?p=40590"},"modified":"2024-05-02T06:56:45","modified_gmt":"2024-05-02T06:56:45","slug":"upsc-prelims-topic-wise-questions-chemistry-basic-of-chemistry-and-structure-of-atom","status":"publish","type":"post","link":"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-chemistry-basic-of-chemistry-and-structure-of-atom\/","title":{"rendered":"UPSC Prelims Topic Wise Questions &#8211; Chemistry &#8211; Basic of Chemistry and Structure of Atom"},"content":{"rendered":"\n\n\n<p>Master the fundamentals of Chemistry and the structure of the atom with our meticulously curated collection of topic-wise questions for the UPSC Prelims. Dive deep into the basics of Chemistry, understanding essential concepts without the fluff. From atomic structure to chemical bonding, our questions cover everything you need to know to excel in your exam. Explore the intricacies of atomic models, electron configurations, and periodic trends with clarity and precision. Whether you&#8217;re revising key principles or aiming to strengthen your foundation, our resource provides comprehensive coverage for effective preparation. Boost your confidence and enhance your understanding of Chemistry with our UPSC Prelims Topic Wise Questions &#8211; Chemistry &#8211; Basics of Chemistry and Structure of Atom. Ace your exam with a solid grasp of fundamental concepts essential for success.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_73 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<label for=\"ez-toc-cssicon-toggle-item-69d2f44ff26a5\" class=\"ez-toc-cssicon-toggle-label\"><p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-cssicon\"><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><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-69d2f44ff26a5\"  \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-chemistry-basic-of-chemistry-and-structure-of-atom\/#Q1_The_alpha_particle_carries_two_positive_charges_Its_mass_is_very_nearly_equal_to_that_of_1996\" title=\"Q1. The alpha particle carries two positive charges. Its mass is very nearly equal to that of (1996)\">Q1. The alpha particle carries two positive charges. Its mass is very nearly equal to that of (1996)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-chemistry-basic-of-chemistry-and-structure-of-atom\/#Ans_b\" title=\"Ans. (b)\">Ans. (b)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-chemistry-basic-of-chemistry-and-structure-of-atom\/#Q2_In_an_atom_the_order_of_filling_up_of_the_orbitals_is_governed_by_2001\" title=\"Q2. In an atom, the order of filling up of the orbitals is governed by (2001)\">Q2. In an atom, the order of filling up of the orbitals is governed by (2001)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-chemistry-basic-of-chemistry-and-structure-of-atom\/#Ans_a\" title=\"Ans. (a)\">Ans. (a)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-chemistry-basic-of-chemistry-and-structure-of-atom\/#Q3_Which_one_of_the_following_is_the_correct_sequence_in_increasing_order_of_molecular_weights_of_the_hydrocarbons_2001\" title=\"Q3. Which one of the following is the correct sequence in increasing order, of molecular weights of the hydrocarbons? (2001)\">Q3. Which one of the following is the correct sequence in increasing order, of molecular weights of the hydrocarbons? (2001)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-chemistry-basic-of-chemistry-and-structure-of-atom\/#Ans_a-2\" title=\"Ans. (a)\">Ans. (a)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-chemistry-basic-of-chemistry-and-structure-of-atom\/#Q4_Match_List_I_with_List_II_and_select_the_correct_answer_using_the_codes_given_below_the_list_2001\" title=\"Q4. Match List I with List II and select the correct answer using the codes given below the list. (2001)\">Q4. Match List I with List II and select the correct answer using the codes given below the list. (2001)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-chemistry-basic-of-chemistry-and-structure-of-atom\/#Ans_a-3\" title=\"Ans. (a)\">Ans. (a)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-chemistry-basic-of-chemistry-and-structure-of-atom\/#Q5_Regarding_the_atom_of_a_chemical_element_magnetic_quantum_number_refers_to_2003\" title=\"Q5. Regarding the atom of a chemical element, magnetic quantum number refers to (2003)\">Q5. Regarding the atom of a chemical element, magnetic quantum number refers to (2003)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-chemistry-basic-of-chemistry-and-structure-of-atom\/#Ans_a-4\" title=\"Ans. (a)\">Ans. (a)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-chemistry-basic-of-chemistry-and-structure-of-atom\/#In_case_you_still_have_your_doubts_contact_us_on_9811333901\" title=\"In case you still have your doubts, contact us on 9811333901.&nbsp;\">In case you still have your doubts, contact us on 9811333901.&nbsp;<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/edukemy.com\/blog\/upsc-prelims-topic-wise-questions-chemistry-basic-of-chemistry-and-structure-of-atom\/#Visit_our_YouTube_Channel_%E2%80%93_here\" title=\"Visit our YouTube Channel &#8211;&nbsp;here\">Visit our YouTube Channel &#8211;&nbsp;here<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Q1_The_alpha_particle_carries_two_positive_charges_Its_mass_is_very_nearly_equal_to_that_of_1996\"><\/span><strong>Q1. The alpha particle carries two positive charges. Its mass is very nearly equal to that of (1996)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>(a) two protons<\/p>\n\n\n\n<p>(b) an atom of helium<\/p>\n\n\n\n<p>(c) sum of masses of two positrons and two neutrons<\/p>\n\n\n\n<p>(d) two positrons as each positron carries a single positive charge<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ans_b\"><\/span><strong>Ans. (b)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>The alpha particle (\u03b1) bears two positive charges and has a mass very close to that of a helium atom. As we know, each alpha particle consists of two protons and two neutrons. The total number of nucleons in an alpha particle equals the sum of protons and neutrons, which is 2 + 2 = 4 atomic mass units (amu). This total number of nucleons is equivalent to the mass number of an element. Hence, the mass number of an alpha particle is 4 amu, which is identical to the molecular weight of a helium atom.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Q2_In_an_atom_the_order_of_filling_up_of_the_orbitals_is_governed_by_2001\"><\/span><strong>Q2. In an atom, the order of filling up of the orbitals is governed by (2001)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>(a) Aufbau principle<\/p>\n\n\n\n<p>(b) Heisenberg&#8217;s uncertainty principle<\/p>\n\n\n\n<p>(c) Hund&#8217;s rule<\/p>\n\n\n\n<p>(d) Pauli&#8217;s exclusion principle<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ans_a\"><\/span><strong>Ans. (a)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>In an atom, the sequence of filling up orbitals follows the Aufbau principle. According to this principle, electrons are added to an atom one by one, beginning with the lower energy orbitals and proceeding to higher energy ones until all the electrons are placed in the appropriate orbitals.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Q3_Which_one_of_the_following_is_the_correct_sequence_in_increasing_order_of_molecular_weights_of_the_hydrocarbons_2001\"><\/span><strong>Q3. Which one of the following is the correct sequence in increasing order, of molecular weights of the hydrocarbons? (2001)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>(a) Methane, ethane, propane and butane<\/p>\n\n\n\n<p>(b) Propane, butane, ethane and methane<\/p>\n\n\n\n<p>(c) Butane, ethane, propane and methane<\/p>\n\n\n\n<p>(d) Butane, propane, ethane and methane<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ans_a-2\"><\/span><strong>Ans. (a)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>The molecular weight of hydrocarbons can be determined by composing the formula of each hydrocarbon. For example:<\/p>\n\n\n\n<ul class=\"has-normal-font-size wp-block-list\"><li>Methane: CH<sub>4<\/sub> = 12 + 4 = 16<\/li><li>Ethane: C<sub>2<\/sub>H<sub>6<\/sub> = 12 \u00d7 2 + 1 \u00d7 6 = 30<\/li><li>Propane: C<sub>3<\/sub>H<sub>8<\/sub> = 12 \u00d7 3 + 1 \u00d7 8 = 44<\/li><li>Butane: C<sub>4<\/sub>H<sub>10<\/sub> = 12 \u00d7 4 + 1 \u00d7 10 = 58<\/li><\/ul>\n\n\n\n<p>The correct sequence in increasing order of molecular weight of the hydrocarbons is CH<sub>4<\/sub>, C<sub>2<\/sub>H<sub>6<\/sub>, C<sub>3<\/sub>H<sub>8<\/sub>, C<sub>4<\/sub>H<sub>10<\/sub>. In other words, as the number of carbon atoms increases, so does the molecular weight of the hydrocarbon.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Q4_Match_List_I_with_List_II_and_select_the_correct_answer_using_the_codes_given_below_the_list_2001\"><\/span><strong>Q4. Match List I with List II and select the correct answer using the codes given below the list. (2001)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><div class=\"pcrstb-wrap\"><table><tbody><tr><td><strong>List I<\/strong><br>(Characteristics)<\/td><td><strong>List II<\/strong><br>(Particles)<\/td><\/tr><tr><td>A. Zero Mass<\/td><td>1. Positron<\/td><\/tr><tr><td>B. Fractional charge<\/td><td>2. Neutrino<\/td><\/tr><tr><td>C. Fractional spin<\/td><td>3. Quark<\/td><\/tr><tr><td>D. Integral spin<\/td><td>4. Photon<\/td><\/tr><\/tbody><\/table><\/div><\/figure>\n\n\n\n<p><strong>Codes<\/strong><\/p>\n\n\n\n<p>A B C D<\/p>\n\n\n\n<p>(a)  2 3 1 4<\/p>\n\n\n\n<p>(b) 3 2 4 1<\/p>\n\n\n\n<p>(c) 2 3 4 1<\/p>\n\n\n\n<p>(d) 3 2 1 4<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ans_a-3\"><\/span><strong>Ans. (a)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>The correct matching is A-2, B-3, C-1, D-4.<\/p>\n\n\n\n<ul class=\"has-normal-font-size wp-block-list\"><li>Positron is similar to an electron but carries a positive charge (+1) instead of a negative charge (-1). Both have fractional spins denoted as +1\/2 or -1\/2. Positron is the antiparticle of an electron.<\/li><li>Neutrino is considered a massless particle by physicists. It is believed to have properties opposite to those of a neutron and is also referred to as the antiparticle of a neutron.<\/li><li>Quarks are fundamental particles that constitute particles such as protons and neutrons. They possess fractional charges like +1\/3 or +2\/3.<\/li><li>Photon, like quarks, is a fundamental particle (classified as a boson) with an integer spin of +1 or -1.<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Q5_Regarding_the_atom_of_a_chemical_element_magnetic_quantum_number_refers_to_2003\"><\/span><strong>Q5. Regarding the atom of a chemical element, magnetic quantum number refers to (2003)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>(a) orientation<\/p>\n\n\n\n<p>(b) shape<\/p>\n\n\n\n<p>(c) size<\/p>\n\n\n\n<p>(d) spin<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ans_a-4\"><\/span><strong>Ans. (a)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Regarding the atom of a chemical element, the magnetic quantum number refers to orientation. The magnetic quantum number (m) specifies the orientation of an atomic orbital in space relative to an external magnetic field.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><a href=\"https:\/\/edukemy.com\/upsc\/upsc-essay?utm_source=Blog&amp;utm_medium=Banner&amp;utm_campaign=Essay\" target=\"_blank\" rel=\"noreferrer noopener\"><img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2024\/06\/UPSC-Essay-Course-1280\u00d7300-1-3.svg\" alt=\"\" class=\"wp-image-42688\" width=\"781\" height=\"182\"\/><\/a><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"In_case_you_still_have_your_doubts_contact_us_on_9811333901\"><\/span><strong>In case you still have your doubts, contact us on 9811333901.<\/strong>&nbsp;<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>For UPSC Prelims Resources,&nbsp;<a href=\"https:\/\/edukemy.com\/upsc-cse-prelims-resource-centre\" target=\"_blank\" rel=\"noreferrer noopener\">Click here<\/a><\/p>\n\n\n\n<p>For Daily Updates and Study Material:<\/p>\n\n\n\n<p>Join our Telegram Channel &#8211;&nbsp;<a href=\"https:\/\/t.me\/WithEdukemy4IAS\" target=\"_blank\" rel=\"noreferrer noopener\">Edukemy for IAS<\/a><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>1. 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Mains Answer Writing Practice &#8211;&nbsp;<a href=\"https:\/\/bit.ly\/3mZuVxl\" target=\"_blank\" rel=\"noreferrer noopener\">here<\/a><\/li><\/ul>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Visit_our_YouTube_Channel_%E2%80%93_here\"><\/span>Visit our YouTube Channel &#8211;&nbsp;<a href=\"https:\/\/www.youtube.com\/@EduKemyforIAS\">here<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n","protected":false},"excerpt":{"rendered":"<p>Master the fundamentals of Chemistry and the structure of the atom with our meticulously curated collection of topic-wise questions<\/p>\n","protected":false},"author":21,"featured_media":40591,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"_lmt_disableupdate":"","_lmt_disable":"","footnotes":""},"categories":[3078],"tags":[3013,232,231,179,140],"class_list":["post-40590","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-upsc-prelims-topic-wise-question","tag-chemistry","tag-upsc","tag-upsc-prelims","tag-upsc-prelims-strategy","tag-upsc_preparation_strategy"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/edukemy.com\/blog\/wp-json\/wp\/v2\/posts\/40590","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/edukemy.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/edukemy.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/edukemy.com\/blog\/wp-json\/wp\/v2\/users\/21"}],"replies":[{"embeddable":true,"href":"https:\/\/edukemy.com\/blog\/wp-json\/wp\/v2\/comments?post=40590"}],"version-history":[{"count":1,"href":"https:\/\/edukemy.com\/blog\/wp-json\/wp\/v2\/posts\/40590\/revisions"}],"predecessor-version":[{"id":40592,"href":"https:\/\/edukemy.com\/blog\/wp-json\/wp\/v2\/posts\/40590\/revisions\/40592"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/edukemy.com\/blog\/wp-json\/wp\/v2\/media\/40591"}],"wp:attachment":[{"href":"https:\/\/edukemy.com\/blog\/wp-json\/wp\/v2\/media?parent=40590"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/edukemy.com\/blog\/wp-json\/wp\/v2\/categories?post=40590"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/edukemy.com\/blog\/wp-json\/wp\/v2\/tags?post=40590"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}