{"id":217856,"date":"2025-05-22T15:13:59","date_gmt":"2025-05-22T15:13:59","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=217856"},"modified":"2025-05-22T20:55:40","modified_gmt":"2025-05-22T20:55:40","slug":"which-pairs-of-reactants-will-result-in-a-chemical-reaction","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/05\/22\/which-pairs-of-reactants-will-result-in-a-chemical-reaction\/","title":{"rendered":"Which pairs of reactants will result in a chemical reaction"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Which pairs of reactants will result in a chemical reaction?<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Mn(s) + AgClO3(aq)<\/li>\n\n\n\n<li>Hg(s) + CoBr2(aq)<\/li>\n\n\n\n<li>Ni(s) + MgCl2(aq)<\/li>\n\n\n\n<li>Cd(s) + CuNO3(aq)<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-1-color\">The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">To determine which pairs of reactants will result in a chemical reaction, we need to apply the concept of <strong>single-replacement reactions<\/strong> and the <strong>activity series of metals<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A <strong>single-replacement reaction<\/strong> occurs when a more <strong>reactive metal<\/strong> displaces a less reactive metal from its compound (usually in aqueous solution). The general form is:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>A (metal) + B\u207aX\u207b (metal salt) \u2192 A\u207aX\u207b + B (solid metal)<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This reaction only proceeds if <strong>metal A is more reactive than metal B<\/strong>, which is determined using the <strong>activity series of metals<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Here is the list of the metals involved and their positions (from most to least reactive):<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Mn (Manganese)<\/strong> \u2013 very reactive<\/li>\n\n\n\n<li><strong>Cd (Cadmium)<\/strong> \u2013 moderately reactive<\/li>\n\n\n\n<li><strong>Ni (Nickel)<\/strong> \u2013 less reactive than Mn and Cd<\/li>\n\n\n\n<li><strong>Hg (Mercury)<\/strong> \u2013 low reactivity<\/li>\n\n\n\n<li><strong>Mg (Magnesium)<\/strong> \u2013 very reactive<\/li>\n\n\n\n<li><strong>Cu (Copper)<\/strong> \u2013 low reactivity<\/li>\n\n\n\n<li><strong>Co (Cobalt)<\/strong> \u2013 reactive<\/li>\n\n\n\n<li><strong>Ag (Silver)<\/strong> \u2013 very low reactivity<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Now, let\u2019s analyze each pair:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Mn(s) + AgClO\u2083(aq)<\/strong><br>Mn is more reactive than Ag.<br>\u2705 <strong>Reaction occurs<\/strong>: Mn displaces Ag from AgClO\u2083.<\/li>\n\n\n\n<li><strong>Hg(s) + CoBr\u2082(aq)<\/strong><br>Hg is <em>less<\/em> reactive than Co.<br>\u274c <strong>No reaction<\/strong>: Hg cannot displace Co.<\/li>\n\n\n\n<li><strong>Ni(s) + MgCl\u2082(aq)<\/strong><br>Ni is <em>less<\/em> reactive than Mg.<br>\u274c <strong>No reaction<\/strong>: Ni cannot displace Mg.<\/li>\n\n\n\n<li><strong>Cd(s) + CuNO\u2083(aq)<\/strong><br>Cd is more reactive than Cu.<br>\u2705 <strong>Reaction occurs<\/strong>: Cd displaces Cu from CuNO\u2083.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">\u2705 Correct pairs that will result in a reaction:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Mn(s) + AgClO\u2083(aq)<\/strong><\/li>\n\n\n\n<li><strong>Cd(s) + CuNO\u2083(aq)<\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These reactions occur because manganese and cadmium are higher on the activity series than silver and copper, respectively. They can lose electrons more easily and thus replace the less reactive metals in their ionic compounds, forming new compounds and releasing the replaced metal as a solid.<\/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\/image-88.png\" alt=\"\" class=\"wp-image-217857\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Which pairs of reactants will result in a chemical reaction? The Correct Answer and Explanation is: To determine which pairs of reactants will result in a chemical reaction, we need to apply the concept of single-replacement reactions and the activity series of metals. A single-replacement reaction occurs when a more reactive metal displaces a less [&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-217856","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/217856","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=217856"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/217856\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=217856"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=217856"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=217856"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}