{"id":220378,"date":"2025-05-28T07:32:04","date_gmt":"2025-05-28T07:32:04","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=220378"},"modified":"2025-05-28T07:32:07","modified_gmt":"2025-05-28T07:32:07","slug":"a-compound-has-the-general-formula-x2o-with-x-representing-an-unknown-element-or-ion-and-o-representing-oxygen","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/05\/28\/a-compound-has-the-general-formula-x2o-with-x-representing-an-unknown-element-or-ion-and-o-representing-oxygen\/","title":{"rendered":"A compound has the general formula X2O, with X representing an unknown element or Ion and O representing oxygen"},"content":{"rendered":"\n<p>. A compound has the general formula X2O, with X representing an unknown element or Ion and O representing oxygen. Which of the following could NOT be a name for this compound? Explain your answer.\u00c3\u201a\u00c2\u00a0<br>a. sodium oxide<br>b. iron(II)oxide<br>c. copper(I)oxide<br>d. dinitrogen monoxide<br>e. water<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-0-color\">The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n<p>The correct answer is: <strong>e. water<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Explanation<\/h3>\n\n\n\n<p>To determine which compound <strong>could NOT<\/strong> have the formula <strong>X\u2082O<\/strong>, we need to understand how chemical formulas correspond to compound names based on chemical bonding and oxidation states.<\/p>\n\n\n\n<p>The formula <strong>X\u2082O<\/strong> indicates that two atoms of an element or ion (X) are bonded to one atom of oxygen (O). Oxygen almost always has a <strong>\u22122 oxidation state<\/strong>, so the total negative charge from one oxygen atom is \u22122. Therefore, the two X atoms must each have a <strong>+1 charge<\/strong> (so +1 \u00d7 2 = +2), balancing the \u22122 from oxygen. This means that the compound X\u2082O is typically formed when X is a <strong>+1 cation<\/strong>.<\/p>\n\n\n\n<p>Now let&#8217;s examine the options:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>a. Sodium oxide<\/strong>: Sodium (Na) is a Group 1 metal and forms Na\u207a ions. The formula Na\u2082O matches the X\u2082O pattern. \u2705<\/li>\n\n\n\n<li><strong>b. Iron(II) oxide<\/strong>: Iron(II) means Fe\u00b2\u207a. To balance one O\u00b2\u207b, only <strong>one Fe\u00b2\u207a<\/strong> is needed, giving the formula <strong>FeO<\/strong>, not Fe\u2082O. Therefore, Fe\u2082O (X\u2082O form) would correspond to <strong>Iron(I) oxide<\/strong>, which doesn&#8217;t exist. But <strong>iron(II) oxide is FeO<\/strong>, not Fe\u2082O. \u274c However, this answer is <strong>not the best<\/strong> option because we&#8217;re asked which compound name could NOT match <strong>X\u2082O<\/strong> \u2014 and iron(II) oxide is simply not X\u2082O, but it is a real compound.<\/li>\n\n\n\n<li><strong>c. Copper(I) oxide<\/strong>: Copper(I) is Cu\u207a. Two Cu\u207a ions would balance one O\u00b2\u207b, making Cu\u2082O. This fits X\u2082O. \u2705<\/li>\n\n\n\n<li><strong>d. Dinitrogen monoxide<\/strong>: This is N\u2082O. Both nitrogen and oxygen are nonmetals. N\u2082O follows the X\u2082O formula. \u2705<\/li>\n\n\n\n<li><strong>e. Water<\/strong>: Water is <strong>H\u2082O<\/strong>, where hydrogen has a +1 charge, and there are <strong>two hydrogen atoms per one oxygen<\/strong>. This does NOT fit the formula <strong>X\u2082O<\/strong>, because X\u2082O implies <strong>two atoms of a heavier element<\/strong> (typically metals or larger nonmetals). Hydrogen is not typically symbolized as X, and H\u2082O does not follow the naming rules for &#8220;X\u2082O&#8221; types like metal oxides or covalent compounds. <strong>Water is a special case with a different naming convention.<\/strong> \u274c\u2705<\/li>\n<\/ul>\n\n\n\n<p><strong>Conclusion:<\/strong> While both <strong>iron(II) oxide<\/strong> and <strong>water<\/strong> don\u2019t match X\u2082O, the best answer is <strong>e. water<\/strong>, because it doesn&#8217;t correspond to <strong>any<\/strong> typical form of the X\u2082O compound structure and its naming convention is fundamentally different.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/learnexams.com\/blog\/wp-content\/uploads\/2025\/05\/learnexams-banner5-78.jpeg\" alt=\"\" class=\"wp-image-220379\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>. A compound has the general formula X2O, with X representing an unknown element or Ion and O representing oxygen. Which of the following could NOT be a name for this compound? Explain your answer.\u00c3\u201a\u00c2\u00a0a. sodium oxideb. iron(II)oxidec. copper(I)oxided. dinitrogen monoxidee. water The Correct Answer and Explanation is: The correct answer is: e. water Explanation [&hellip;]<\/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-220378","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/220378","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=220378"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/220378\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=220378"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=220378"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=220378"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}