{"id":206005,"date":"2025-03-26T06:57:38","date_gmt":"2025-03-26T06:57:38","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=206005"},"modified":"2025-03-26T06:57:40","modified_gmt":"2025-03-26T06:57:40","slug":"which-of-the-following-is-the-strongest-acid-3","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/03\/26\/which-of-the-following-is-the-strongest-acid-3\/","title":{"rendered":"Which of the following is the strongest acid"},"content":{"rendered":"\n

Which of the following is the strongest acid?<\/p>\n\n\n\n

A) HF ( Ka for HF is 7.2 \u00d7 10-4)<\/p>\n\n\n\n

B) HCN (Ka for HCN is 4.9 \u00d7 10-10)<\/p>\n\n\n\n

C) HCNO (Ka for HCNO is 2 \u00d7 10-10)<\/p>\n\n\n\n

D) H3BO3 (Ka for H3BO3 is 5.4 \u00d7 10-10)<\/p>\n\n\n\n

The correct answer and explanation is :<\/strong><\/mark><\/p>\n\n\n\n

The strongest acid among the given options is HF (hydrofluoric acid)<\/strong> because it has the highest acid dissociation constant (Ka<\/strong>).<\/p>\n\n\n\n

Explanation:<\/h3>\n\n\n\n

Acid strength is determined by its Ka<\/strong> value, which represents how much the acid ionizes in water. A higher Ka value<\/strong> means greater ionization and a stronger acid<\/strong>. Let’s compare the given Ka values:<\/p>\n\n\n\n

    \n
  • HF<\/strong>: Ka = 7.2 \u00d7 10\u207b\u2074<\/strong><\/li>\n\n\n\n
  • HCN<\/strong>: Ka = 4.9 \u00d7 10\u207b\u00b9\u2070<\/strong><\/li>\n\n\n\n
  • HCNO<\/strong>: Ka = 2 \u00d7 10\u207b\u00b9\u2070<\/strong><\/li>\n\n\n\n
  • H\u2083BO\u2083<\/strong>: Ka = 5.4 \u00d7 10\u207b\u00b9\u2070<\/strong><\/li>\n<\/ul>\n\n\n\n

    Since HF has the largest Ka value<\/strong>, it ionizes more in water compared to the others, making it the strongest acid<\/strong> among the given choices.<\/p>\n\n\n\n

    Why is HF the strongest?<\/h3>\n\n\n\n
      \n
    1. Higher Ka Value<\/strong>: HF has a Ka of 7.2 \u00d7 10\u207b\u2074<\/strong>, significantly greater than the other acids. This means HF dissociates more in solution, releasing more H\u207a ions<\/strong>.<\/li>\n\n\n\n
    2. Bond Strength<\/strong>: The H-F bond is relatively strong<\/strong>, but due to the high electronegativity of fluorine, it still allows partial ionization.<\/li>\n\n\n\n
    3. Comparison with Other Acids<\/strong>:<\/li>\n<\/ol>\n\n\n\n
        \n
      • HCN and HCNO<\/strong> are much weaker acids because their Ka values are several orders of magnitude lower.<\/li>\n\n\n\n
      • H\u2083BO\u2083 (Boric Acid)<\/strong> is not even a typical proton-donating acid but acts as a Lewis acid, meaning it does not release H\u207a<\/strong> ions directly.<\/li>\n<\/ul>\n\n\n\n

        Thus, HF is the strongest acid in this list<\/strong>. However, note that HF is still considered a weak acid<\/strong> compared to strong acids like HCl or HNO\u2083.<\/p>\n\n\n\n

        \"\"<\/figure>\n","protected":false},"excerpt":{"rendered":"

        Which of the following is the strongest acid? A) HF ( Ka for HF is 7.2 \u00d7 10-4) B) HCN (Ka for HCN is 4.9 \u00d7 10-10) C) HCNO (Ka for HCNO is 2 \u00d7 10-10) D) H3BO3 (Ka for H3BO3 is 5.4 \u00d7 10-10) The correct answer and explanation is : The strongest acid […]<\/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-206005","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/206005","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=206005"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/206005\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=206005"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=206005"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=206005"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}