Which of the following represents a redox reaction? 2 HCl + Na2SO3 ?2NaCl + H2O + SO2 AgNO3 + NaCl ? AgCl + NaNO3 CaCO3 + 2 HBr ? CaBr2 + H2O + CO2 CuS + H2 ? H2S + Cu<\/p>\n\n\n\n
The Correct Answer and Explanation is :<\/strong><\/mark><\/p>\n\n\n\n The redox reaction among the options is:<\/p>\n\n\n\n CuS + H2 \u2192 H2S + Cu<\/strong><\/p>\n\n\n\n A redox (reduction-oxidation) reaction involves the transfer of electrons between two species, where one species undergoes oxidation (loses electrons), and the other undergoes reduction (gains electrons). In simpler terms:<\/p>\n\n\n\n Now, let\u2019s break down the reactions and analyze which one is a redox reaction:<\/p>\n\n\n\n The correct answer is CuS + H2 \u2192 H2S + Cu<\/strong>, as it shows a clear transfer of electrons (reduction and oxidation).<\/p>\n\n\n\n Now, I\u2019ll generate an image illustrating the redox reaction.<\/p>\n\n\n\n Here is an illustration of the redox reaction between copper sulfide (CuS) and hydrogen (H2). It shows how copper is reduced and hydrogen is oxidized in the reaction. Let me know if you need further clarification!<\/p>\n","protected":false},"excerpt":{"rendered":" Which of the following represents a redox reaction? 2 HCl + Na2SO3 ?2NaCl + H2O + SO2 AgNO3 + NaCl ? AgCl + NaNO3 CaCO3 + 2 HBr ? CaBr2 + H2O + CO2 CuS + H2 ? H2S + Cu The Correct Answer and Explanation is : The redox reaction among the options is: […]<\/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-192565","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/192565","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=192565"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/192565\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=192565"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=192565"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=192565"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Explanation:<\/h3>\n\n\n\n
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This is not a redox reaction<\/strong> because there is no change in oxidation states of the elements involved. The sulfur in Na2SO3 remains in the same oxidation state (+4), and the chlorine in HCl also does not undergo a change in its oxidation state.<\/li>\n\n\n\n
This is an ionic exchange reaction<\/strong>, not a redox reaction. Both silver (Ag) and sodium (Na) remain in their +1 oxidation states throughout the reaction.<\/li>\n\n\n\n
This is also not a redox reaction<\/strong>. The calcium (Ca) and bromine (Br) do not change oxidation states. The reaction is a simple acid-base reaction with a salt and water formed.<\/li>\n\n\n\n
This is a redox reaction<\/strong> because it involves changes in oxidation states. Copper (Cu) in CuS is in the +2 oxidation state and gets reduced to elemental copper (0). Hydrogen (H2) is oxidized from an oxidation state of 0 to +1 in H2S. Hence, Cu is reduced, and H2 is oxidized.<\/li>\n<\/ol>\n\n\n\n