{"id":198668,"date":"2025-03-10T08:32:49","date_gmt":"2025-03-10T08:32:49","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=198668"},"modified":"2025-03-10T08:33:05","modified_gmt":"2025-03-10T08:33:05","slug":"the-boiling-point-of-nh3-ph3ash3-and-sbh3-are-respectively-33-4-oc-87-5-oc-62-4-oc-18-4oc-explain-the-variation-of-their-boiling-points-in-terms-of-the-types-of-intermolecular-forces","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/03\/10\/the-boiling-point-of-nh3-ph3ash3-and-sbh3-are-respectively-33-4-oc-87-5-oc-62-4-oc-18-4oc-explain-the-variation-of-their-boiling-points-in-terms-of-the-types-of-intermolecular-forces\/","title":{"rendered":"The boiling point of NH3, PH3,AsH3 and SbH3 are respectively -33.4 oC,-87.5 oC, -62.4 oC, -18.4oC"},"content":{"rendered":"\n
The boiling point of NH3, PH3,AsH3 and SbH3 are respectively -33.4 oC,-87.5 oC, -62.4 oC, -18.4oC. Explain the variation of their boiling points in terms of the types of intermolecular forces.<\/p>\n\n\n\n
The correct answer and explanation is :<\/strong><\/mark><\/p>\n\n\n\n
The boiling points of NH\u2083 (-33.4\u00b0C), PH\u2083 (-87.5\u00b0C), AsH\u2083 (-62.4\u00b0C), and SbH\u2083 (-18.4\u00b0C) vary due to the different types of intermolecular forces acting on them. These forces include hydrogen bonding, dipole-dipole interactions, and London dispersion forces.<\/p>\n\n\n\n
Explanation of Variation in Boiling Points:<\/strong><\/h3>\n\n\n\n\n
Ammonia (NH\u2083) – Strong Hydrogen Bonding<\/strong> NH\u2083 has a relatively high boiling point (-33.4\u00b0C) because of the presence of strong hydrogen bonding. Nitrogen is highly electronegative, creating a large dipole moment and allowing strong hydrogen bonds to form between NH\u2083 molecules. This significantly increases the energy required to break these intermolecular forces, leading to a higher boiling point.<\/li>\n\n\n\n
Phosphine (PH\u2083) – Weak Dipole-Dipole Interactions<\/strong> PH\u2083 has a much lower boiling point (-87.5\u00b0C) because phosphorus is less electronegative than nitrogen, making hydrogen bonding almost negligible. Instead, PH\u2083 molecules experience weaker dipole-dipole interactions and London dispersion forces, resulting in a lower boiling point.<\/li>\n\n\n\n
Arsine (AsH\u2083) and Stibine (SbH\u2083) – Increasing London Dispersion Forces<\/strong><\/li>\n<\/ol>\n\n\n\n
\n
AsH\u2083 (-62.4\u00b0C) and SbH\u2083 (-18.4\u00b0C) follow an increasing trend in boiling points. This is because as we move down the group, the molecular size and molar mass increase, leading to stronger London dispersion forces (temporary dipole-induced dipole interactions).<\/li>\n\n\n\n
SbH\u2083, being the largest molecule, has the strongest London dispersion forces, giving it the highest boiling point (-18.4\u00b0C) among PH\u2083, AsH\u2083, and SbH\u2083.<\/li>\n<\/ul>\n\n\n\n
Conclusion:<\/strong><\/h3>\n\n\n\n
\n
NH\u2083 has the highest boiling point due to hydrogen bonding<\/strong>.<\/li>\n\n\n\n
PH\u2083, AsH\u2083, and SbH\u2083 primarily rely on London dispersion forces<\/strong>, which increase with molecular mass.<\/li>\n\n\n\n
This results in SbH\u2083 having the highest boiling point among the three, while PH\u2083 has the lowest due to weak intermolecular forces.<\/li>\n<\/ul>\n\n\n\n<\/figure>\n\n\n\n
Here is the scientific diagram illustrating the intermolecular forces affecting NH\u2083, PH\u2083, AsH\u2083, and SbH\u2083. The image highlights hydrogen bonding in NH\u2083, weaker dipole-dipole interactions in PH\u2083, AsH\u2083, and SbH\u2083, and increasing London dispersion forces with molecular size. Additionally, it includes a boiling point trend graph.<\/p>\n","protected":false},"excerpt":{"rendered":"
The boiling point of NH3, PH3,AsH3 and SbH3 are respectively -33.4 oC,-87.5 oC, -62.4 oC, -18.4oC. Explain the variation of their boiling points in terms of the types of intermolecular forces. The correct answer and explanation is : The boiling points of NH\u2083 (-33.4\u00b0C), PH\u2083 (-87.5\u00b0C), AsH\u2083 (-62.4\u00b0C), and SbH\u2083 (-18.4\u00b0C) vary due to the […]<\/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-198668","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/198668","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=198668"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/198668\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=198668"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=198668"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=198668"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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