{"id":180468,"date":"2025-01-06T14:05:29","date_gmt":"2025-01-06T14:05:29","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=180468"},"modified":"2025-01-06T14:05:31","modified_gmt":"2025-01-06T14:05:31","slug":"in-agbr-there-can-occur","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/01\/06\/in-agbr-there-can-occur\/","title":{"rendered":"In AgBr, there can occur"},"content":{"rendered":"\n

In AgBr, there can occur<\/strong><\/p>\n\n\n\n

A<\/td>only Schottky defect<\/td><\/tr>
B<\/td>only Frenkel defect<\/td><\/tr>
C<\/td>Both (a) and (b)<\/td><\/tr>
D<\/td>Neither (a) nor (b)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
Question 7<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

In an antifluorite structure, cations occupy<\/strong><\/p>\n\n\n\n

A<\/td>tetrahedral voids<\/td><\/tr>
B<\/td>centre of cube<\/td><\/tr>
C<\/td>octahedral voids<\/td><\/tr>
D<\/td>corners of cube<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
Question 8<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

In Na2<\/sub>O having antifluorite structure<\/strong>AOxide ions have a cubic close packed arrangement and Na+<\/sup> occupy all the eight tetrahedral voids.BOxide ions have a cubic close packed arrangement and Na+<\/sup> occupy all the octahedral voidsCNa+<\/sup> ions have a cubic close arrangement and O2<\/sup>–<\/sup> occupy all the octahedral voidsDNa+<\/sup> ions have a cubic close arrangement and O–<\/sup>2<\/sup> occupy all the tetrahedral voids<\/p>\n\n\n\n

The Correct Answer and Explanation is :<\/strong><\/mark><\/p>\n\n\n\n

Question 6: Defects in AgBr<\/strong><\/h3>\n\n\n\n
    \n
  • Correct Answer: C (Both Schottky and Frenkel defects)<\/strong><\/li>\n<\/ul>\n\n\n\n

    Explanation:<\/strong>
    AgBr (Silver bromide) is an ionic compound that can exhibit both Schottky and Frenkel defects, which are types of point defects in crystals:<\/p>\n\n\n\n

      \n
    1. Schottky Defect:<\/strong>
      A Schottky defect occurs when an equal number of cations and anions are missing from the lattice, creating vacancies. Since AgBr is an ionic solid, the absence of both Ag\u207a and Br\u207b ions from their lattice positions leads to the creation of vacancies. This defect maintains the overall neutrality of the crystal.<\/li>\n\n\n\n
    2. Frenkel Defect:<\/strong>
      A Frenkel defect occurs when an ion, typically a cation, leaves its normal lattice position and occupies an interstitial site, creating both a vacancy and an interstitial defect. In AgBr, Ag\u207a cations are relatively small, which makes them prone to migrate into interstitial sites, while maintaining the charge neutrality.<\/li>\n<\/ol>\n\n\n\n

      Both types of defects can coexist in AgBr, with Schottky defects leading to vacancies and Frenkel defects creating interstitial positions for Ag\u207a ions. This contributes to the compound\u2019s non-stoichiometric nature, where some ions are displaced from their regular positions.<\/p>\n\n\n\n

      \n\n\n\n

      Question 7: Cations in Antifluorite Structure<\/strong><\/h3>\n\n\n\n
        \n
      • Correct Answer: A (Tetrahedral voids)<\/strong><\/li>\n<\/ul>\n\n\n\n

        Explanation:<\/strong>
        The antifluorite structure<\/strong> is an inverse of the fluorite structure. In a fluorite structure, the cations (e.g., Ca\u00b2\u207a) occupy the tetrahedral voids, and the anions (e.g., F\u207b) occupy the cubic close-packed positions.<\/p>\n\n\n\n

        However, in the antifluorite structure, the positions of cations and anions are reversed. The anions (typically oxide ions, O\u00b2\u207b)<\/strong> occupy the cubic close-packed arrangement, and the cations (typically alkali metal ions like Na\u207a)<\/strong> occupy the tetrahedral voids<\/strong>.<\/p>\n\n\n\n

        In summary, in the antifluorite structure:<\/p>\n\n\n\n

          \n
        • Anions (O\u00b2\u207b) are at the cubic close-packed positions.<\/li>\n\n\n\n
        • Cations (Na\u207a) occupy the tetrahedral voids.<\/li>\n<\/ul>\n\n\n\n
          \n\n\n\n

          Question 8: Na2O in Antifluorite Structure<\/strong><\/h3>\n\n\n\n
            \n
          • Correct Answer: D (Na\u207a ions have a cubic close arrangement, and O\u00b2\u207b occupy all the tetrahedral voids)<\/strong><\/li>\n<\/ul>\n\n\n\n

            Explanation:<\/strong>
            In Na\u2082O (Sodium oxide) with the antifluorite structure:<\/p>\n\n\n\n

              \n
            • O\u00b2\u207b ions<\/strong> form a cubic close-packed arrangement.<\/li>\n\n\n\n
            • The Na\u207a ions<\/strong> occupy all the tetrahedral voids<\/strong> within this arrangement.<\/li>\n<\/ul>\n\n\n\n

              In an antifluorite structure, the roles of the cations and anions are reversed compared to the fluorite structure. In fluorite, the larger cations are in the cubic close-packed arrangement, while in antifluorite, the anions (such as O\u00b2\u207b) occupy those positions. The smaller cations (like Na\u207a) occupy the tetrahedral voids between the anions.<\/p>\n\n\n\n

              Thus, the correct arrangement is that Na\u207a ions are in the tetrahedral voids, and the O\u00b2\u207b ions are in the cubic close-packed structure.<\/p>\n","protected":false},"excerpt":{"rendered":"

              In AgBr, there can occur A only Schottky defect B only Frenkel defect C Both (a) and (b) D Neither (a) nor (b) Question 7 In an antifluorite structure, cations occupy A tetrahedral voids B centre of cube C octahedral voids D corners of cube Question 8 In Na2O having antifluorite structureAOxide ions have a […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-180468","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/180468","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=180468"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/180468\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=180468"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=180468"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=180468"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}