{"id":28379,"date":"2025-06-20T12:06:55","date_gmt":"2025-06-20T12:06:55","guid":{"rendered":"https:\/\/gaviki.com\/blog\/?p=28379"},"modified":"2025-06-20T12:06:56","modified_gmt":"2025-06-20T12:06:56","slug":"which-of-the-following-molecules-or-ions-has-a-trigonal-pyramid-shape","status":"publish","type":"post","link":"https:\/\/gaviki.com\/blog\/which-of-the-following-molecules-or-ions-has-a-trigonal-pyramid-shape\/","title":{"rendered":"Which of the following molecules or ions has a trigonal pyramid shape"},"content":{"rendered":"\n<p>Which of the following molecules or ions has a trigonal pyramid shape? (Molecular Geometry) Select one: a. KrF4 b. NH4+ c. O3 d. SeO32\u00e2\u20ac\u201c e. COCl2<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-pale-pink-color\">The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n<h6 class=\"wp-block-heading\">ChatGPT said:<\/h6>\n\n\n\n<p><strong>Correct Answer: d. SeO\u2083\u00b2\u207b<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Explanation:<\/h3>\n\n\n\n<p>To determine the molecular geometry (shape) of a molecule or ion, we apply the <strong>Valence Shell Electron Pair Repulsion (VSEPR)<\/strong> theory. This theory helps us predict the shape based on the repulsion between electron groups (bonding and lone pairs) around the central atom.<\/p>\n\n\n\n<p>Let&#8217;s analyze each option:<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>a. KrF\u2084 (Krypton tetrafluoride)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Central atom: Kr<\/li>\n\n\n\n<li>Kr has 8 valence electrons<\/li>\n\n\n\n<li>Forms 4 bonds with F and has 2 lone pairs<\/li>\n\n\n\n<li>Total regions of electron density = 6 \u2192 Octahedral electron geometry<\/li>\n\n\n\n<li>With 2 lone pairs, the molecular shape is <strong>square planar<\/strong>, not trigonal pyramidal.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>b. NH\u2084\u207a (Ammonium ion)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Central atom: N<\/li>\n\n\n\n<li>Forms 4 bonds with H<\/li>\n\n\n\n<li>No lone pairs on N<\/li>\n\n\n\n<li>Total electron regions = 4 \u2192 Tetrahedral electron and molecular geometry<\/li>\n\n\n\n<li>This is <strong>not trigonal pyramidal<\/strong>.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>c. O\u2083 (Ozone)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Central atom: One of the oxygen atoms<\/li>\n\n\n\n<li>Has resonance structures with a lone pair and double bond character<\/li>\n\n\n\n<li>Bent or angular shape<\/li>\n\n\n\n<li>Not trigonal pyramidal<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>d. SeO\u2083\u00b2\u207b (Selenite ion)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Central atom: Se<\/li>\n\n\n\n<li>Has 6 valence electrons<\/li>\n\n\n\n<li>Forms 3 bonds with O atoms and has 1 lone pair<\/li>\n\n\n\n<li>Total regions = 4 \u2192 Tetrahedral electron geometry<\/li>\n\n\n\n<li>With 1 lone pair, the shape becomes <strong>trigonal pyramidal<\/strong><\/li>\n<\/ul>\n\n\n\n<p>This <strong>matches the definition<\/strong> of trigonal pyramidal: three atoms bonded to a central atom and one lone pair on the central atom.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>e. COCl\u2082 (Phosgene)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Central atom: C<\/li>\n\n\n\n<li>Forms 2 bonds with Cl and 1 double bond with O<\/li>\n\n\n\n<li>No lone pairs on C<\/li>\n\n\n\n<li>Total regions = 3 \u2192 Trigonal planar shape<\/li>\n\n\n\n<li>Not trigonal pyramidal<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Final Answer: <strong>d. SeO\u2083\u00b2\u207b<\/strong> is the molecule with a <strong>trigonal pyramidal<\/strong> molecular geometry.<\/h3>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"852\" height=\"1024\" src=\"https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner8-210.jpeg\" alt=\"\" class=\"wp-image-28388\" srcset=\"https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner8-210.jpeg 852w, https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner8-210-250x300.jpeg 250w, https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner8-210-768x923.jpeg 768w\" sizes=\"auto, (max-width: 852px) 100vw, 852px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Which of the following molecules or ions has a trigonal pyramid shape? (Molecular Geometry) Select one: a. KrF4 b. NH4+ c. O3 d. SeO32\u00e2\u20ac\u201c e. COCl2 The Correct Answer and Explanation is: ChatGPT said: Correct Answer: d. SeO\u2083\u00b2\u207b Explanation: To determine the molecular geometry (shape) of a molecule or ion, we apply the Valence Shell [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-28379","post","type-post","status-publish","format-standard","hentry","category-quiz-questions"],"_links":{"self":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/28379","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/comments?post=28379"}],"version-history":[{"count":1,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/28379\/revisions"}],"predecessor-version":[{"id":28389,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/28379\/revisions\/28389"}],"wp:attachment":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/media?parent=28379"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/categories?post=28379"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/tags?post=28379"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}