{"id":9951,"date":"2024-07-06T08:20:13","date_gmt":"2024-07-06T07:20:13","guid":{"rendered":"https:\/\/mcqsadda.com\/?p=9951"},"modified":"2024-07-17T11:55:30","modified_gmt":"2024-07-17T10:55:30","slug":"catalyst-set-1","status":"publish","type":"post","link":"https:\/\/mcqsadda.com\/index.php\/2024\/07\/06\/catalyst-set-1\/","title":{"rendered":"Catalyst Set &#8211; 1"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\"><strong>1. Catalysts work by _________.<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>A. Increasing the concentration of reactants<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>B. Decreasing the rate of reaction<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>C. Providing an alternative reaction pathway with a lower activation energy<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>D. Increasing the reaction order<\/strong><\/h3>\n\n\n\n<button class=\"acc\">ANSWER &#038; SOLUTION<\/button>\n<div class=\"pnl\">\n  <p>ANSWER: C.Providing an alternative reaction pathway with a lower activation energy<BR>\nSOLUTION :During a chemical reaction, the bonds between the atoms in molecules are broken, rearranged, and rebuilt, recombining the atoms into new molecules. Catalysts make this process more efficient by lowering the activation energy, which is the energy barrier that must be surmounted for a chemical reaction to occur.<\/p>\n<\/div>egin\n\n\n\n<h2 class=\"wp-block-heading\"><strong>2. A catalyst can ___________<\/strong><\/h2>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>A. Increase the rate of reversible reaction in both the forward and reverse directions<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>B.  Increase the rate of  a reversible reaction only in the forward direction<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>C. Decrease the rate of a reaction<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>D. Increase the activation energy of a reaction<\/strong><\/h3>\n\n\n\n<button class=\"acc\">ANSWER &#038; SOLUTION<\/button>\n<div class=\"pnl\">\n  <p>ANSWER: A.Increase the rate of reversible reaction in both the forward and reverse directions<BR>\nSOLUTION: A catalyst can speed up a chemical reaction, or lower the temperature or pressure needed to start one, without being consumed during the reaction. Catalysts can also change the products of a chemical reaction, such as the heat of reaction, the time it takes the reaction to proceed, and the potential energy of the reactants.<\/p>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>3. Which of the following statements about heterogeneous catalysts is true ?<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>A.  They are always in the same phase as the reachants<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>B. \u00a0They can be easily seperated from the reaction mixture<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>C. They are the chemical composition of the reactants<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>D.  They are highly soluble in the reaction solvent<\/strong><\/h3>\n\n\n\n<button class=\"acc\">ANSWER &#038; SOLUTION<\/button>\n<div class=\"pnl\">\n  <p>ANSWER : B.They can be easily seperated from the reaction mixture<BR>\nSOLUTION: They can be easily seperated from the reaction mixture <\/p>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>4. Poisoning of a catalyst refers to _________. <\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>A. Making the catalyst more active<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>B. Reducing the catalyst&#8217;s activity by introducing unwanted substances<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>C. Increasing the catalyst&#8217;s selectivity<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>D. Promoting the catalyst&#8217;s stability<\/strong><\/h3>\n\n\n\n<button class=\"acc\">ANSWER &#038; SOLUTION<\/button>\n<div class=\"pnl\">\n  <p>ANSWER: B.Reducing the catalyst&#8217;s activity by introducing unwanted substances<BR>\nSOLUTION: Catalyst poisoning is the partial or total deactivation of a catalyst by a chemical compound.<\/p>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>5. \u00a0Selectivity of a catalyst refers to ________<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>A. Its ability to remain unchanged during a reaction<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>B. Its ability to promote multiple side reactions<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>C.  Its ability to favor the formation of a specific product in a reaction<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>D. Its ability to speed up any chemical reaction<\/strong><\/h3>\n\n\n\n<button class=\"acc\">ANSWER &#038; SOLUTION<\/button>\n<div class=\"pnl\">\n  <p>ANSWER: C.Its ability to favor the formation of a specific product in a reaction<BR>\nSOLUTION: Catalysts are highly specific compounds. They have an ability to direct the reaction to yield a particular product. The reaction with same reactants but different catalyst may yield different products. This is termed as the selectivity of catalyst.<\/p>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>6. \u00a0Promoters in catalysis are substances that _______.<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>A.  Decrease the catalytic activity <\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>B. \u00a0Enhance the selectivity of the catalyst<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>C. Increase the reaction rate without being consumed <\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>D. Poison the catalyst <\/strong><\/h3>\n\n\n\n<button class=\"acc\">ANSWER &#038; SOLUTION<\/button>\n<div class=\"pnl\">\n  <p>ANSWER: C.Increase the reaction rate without being consumed <BR>\nSOLUTION: Substances which themselves are not catalysts but when mixed in small quantities with the catalysts increase their efficiency are called as Promoters. Promoters are substances which increase the efficiency of catalyst.<\/p>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>7.  Which of the following factors can influence the effectiveness of a catalyst?<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>A. Temperature and pressure only<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>B.  Concentration of reactants only<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>C. Temperature, concentration of reactants , and catalyst particle size<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>D. Catalyst particle size only<\/strong><\/h3>\n\n\n\n<button class=\"acc\">ANSWER &#038; SOLUTION<\/button>\n<div class=\"pnl\">\n  <p>ANSWER: C.Temperature, concentration of reactants , and catalyst particle size<BR>\nSOLUTION :\nThe factors that influence the catalytic reactivity of a catalyst include the environment of the active sites and the interactions between the catalyst and the reactant molecules. Metal Catalysts for Heterogeneous Catalysis: From Single Atoms to Nanoclusters and Nanoparticles.\n<\/p>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>8. \u00a0Autocatalysis is a phenomenon where ______.<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>A.  The catalyst accelerates its own decomposition<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>B. The reaction rate increases as the reaction progresses<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>C.  The catalyst is consumed in the reaction<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>D. The reaction rate remains constant<\/strong><\/h3>\n\n\n\n<button class=\"acc\">ANSWER &#038; SOLUTION<\/button>\n<div class=\"pnl\">\n  <p>ANSWER: B.The reaction rate increases as the reaction progresses<BR>\nSOLUTION: The reaction rate increases as the reaction progresses<\/p>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>9. A homogeneous catalyst is _________.<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>A. Always in the same phase as the reactants<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>B. Typically a solid in solution<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>C. Insoluble in the reaction medium<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>D. Used exclusively in gas &#8211; phase reactions<\/strong><\/h3>\n\n\n\n<button class=\"acc\">ANSWER &#038; SOLUTION<\/button>\n<div class=\"pnl\">\n  <p>ANSWER: A.Always in the same phase as the reactants<BR>\nSOLUTION: A homogeneous catalyst is present in the same phase as the reactants. Gas-phase reactions and reactions in solution are homogeneous reactions and we have already discussed several examples where catalyst and reactants are all in the same phase.\n<\/p>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>10. \u00a0In the manufacture of ammonia (NH3) through the Haber &#8211; Bosch process, which catalyst is commonly used ?<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>A. Platinum<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>B.  Palladium<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>C. Iron<\/strong><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>D. Nickel<\/strong><\/h3>\n\n\n\n<button class=\"acc\">ANSWER &#038; SOLUTION<\/button>\n<div class=\"pnl\">\n  <p>ANSWER: C.Iron<BR>\nSOLUTION:\nFinely divided iron is used as catalyst in the manufacture of ammonia by Haber&#8217;s process.\n<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>1. Catalysts work by _________. A. Increasing the concentration of reactants B. Decreasing the rate of reaction C. Providing an alternative reaction pathway with a lower activation energy D. Increasing the reaction order ANSWER &#038; SOLUTION ANSWER: C.Providing an alternative reaction pathway with a lower activation energy SOLUTION :During a chemical reaction, the bonds between<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,19],"tags":[5228,5235,5234,5226,5651,5653,5646,5236,4029,5649,5652,5230,5232,5231,5233,5229],"class_list":{"0":"post-9951","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-chemistry","7":"category-science","8":"tag-a-catalyst-can-___________","9":"tag-a-homogeneous-catalyst-is-_________","10":"tag-autocatalysis-is-a-phenomenon-where-______","11":"tag-catalysts-work-by-_________","12":"tag-chemistry-mcqs-for-sda-fda-pdo-vao-banking-kas-ias-ssc-gd-ssc-chsl-ssc-cgl-for-all-compitative-exams","13":"tag-chemistry-mcqs-for-sda-fda-pdo-vao-banking-kas-ias-ssc-gd-ssc-chsl-ssc-cgl-for-all-compitative-examsin-kannada","14":"tag-exam-veda","15":"tag-in-the-manufacture-of-ammonia-nh3-through-the-haber-bosch-process-which-catalyst-is-commonly-used","16":"tag-mcqs-adda","17":"tag-mcqs-for-pc-psi-sda-fda-pdo-vao-banking-kas-ias-ssc-gd-ssc-chsl-ssc-cgl-for-all-compitative-exams","18":"tag-mcqs-for-pc-psi-sda-fda-pdo-vao-banking-kas-ias-ssc-gd-ssc-chsl-ssc-cgl-for-all-compitative-examsin-kannada","19":"tag-poisoning-of-a-catalyst-refers-to-_________","20":"tag-promoters-in-catalysis-are-substances-that-_______","21":"tag-selectivity-of-a-catalyst-refers-to-________","22":"tag-which-of-the-following-factors-can-influence-the-effectiveness-of-a-catalyst","23":"tag-which-of-the-following-statements-about-heterogeneous-catalysts-is-true"},"_links":{"self":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts\/9951","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/comments?post=9951"}],"version-history":[{"count":2,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts\/9951\/revisions"}],"predecessor-version":[{"id":9968,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts\/9951\/revisions\/9968"}],"wp:attachment":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/media?parent=9951"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/categories?post=9951"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/tags?post=9951"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}