{"id":28251,"date":"2025-06-20T11:17:28","date_gmt":"2025-06-20T11:17:28","guid":{"rendered":"https:\/\/gaviki.com\/blog\/?p=28251"},"modified":"2025-06-20T11:17:29","modified_gmt":"2025-06-20T11:17:29","slug":"oxygen-has-an-oxidation-number-of-2-in-_","status":"publish","type":"post","link":"https:\/\/gaviki.com\/blog\/oxygen-has-an-oxidation-number-of-2-in-_\/","title":{"rendered":"Oxygen has an oxidation number of -2 in _"},"content":{"rendered":"\n<p>Oxygen has an oxidation number of -2 in <strong>_<\/strong>. O2 NO2 Na2O2 MgO2<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-light-green-cyan-color\">The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n<p><strong>Correct Answer: NO\u2082<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Explanation:<\/h3>\n\n\n\n<p>Oxidation numbers are used to keep track of the transfer of electrons in chemical compounds. In most compounds, oxygen typically has an oxidation number of <strong>-2<\/strong>. However, there are exceptions based on the type of compound and the elements involved.<\/p>\n\n\n\n<p>Let\u2019s analyze each compound:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>O\u2082 (Oxygen gas):<\/strong><br>In its elemental form, oxygen has an oxidation number of <strong>0<\/strong>. This is true for all elements in their natural state. Therefore, oxygen is <strong>not<\/strong> -2 here.<\/li>\n\n\n\n<li><strong>NO\u2082 (Nitrogen dioxide):<\/strong><br>This compound consists of nitrogen and oxygen. We assume oxygen is -2 unless it is in a peroxide or elemental form.<br>Let the oxidation number of nitrogen be <strong>x<\/strong>.<br>There are two oxygen atoms, each contributing -2, so:<br><strong>x + 2(-2) = 0 \u21d2 x &#8211; 4 = 0 \u21d2 x = +4<\/strong><br>This confirms oxygen is <strong>-2<\/strong> in NO\u2082.<\/li>\n\n\n\n<li><strong>Na\u2082O\u2082 (Sodium peroxide):<\/strong><br>This is a peroxide compound. In peroxides, oxygen has an oxidation number of <strong>-1<\/strong>.<br>Sodium (Na) is an alkali metal, so it always has an oxidation number of <strong>+1<\/strong>.<br>The total oxidation must be zero:<br>2(+1) + 2(x) = 0 \u21d2 2 + 2x = 0 \u21d2 x = -1<br>So oxygen is <strong>-1<\/strong>, <strong>not<\/strong> -2 here.<\/li>\n\n\n\n<li><strong>MgO\u2082 (Magnesium peroxide):<\/strong><br>Like sodium peroxide, this is also a <strong>peroxide<\/strong>, so oxygen has an oxidation number of <strong>-1<\/strong> here as well.<br>Magnesium (Mg) has an oxidation number of <strong>+2<\/strong>, and the two oxygen atoms together must balance this with <strong>2(-1) = -2<\/strong>.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">Conclusion:<\/h3>\n\n\n\n<p>The only compound among the choices where oxygen has an oxidation number of <strong>-2<\/strong> is <strong>NO\u2082<\/strong>. In elemental oxygen (O\u2082) the number is 0, and in both peroxides (Na\u2082O\u2082 and MgO\u2082) the number is -1.<\/p>\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-banner8-197.jpeg\" alt=\"\" class=\"wp-image-28252\" srcset=\"https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner8-197.jpeg 852w, https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner8-197-250x300.jpeg 250w, https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner8-197-768x923.jpeg 768w\" sizes=\"auto, (max-width: 852px) 100vw, 852px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Oxygen has an oxidation number of -2 in _. O2 NO2 Na2O2 MgO2 The Correct Answer and Explanation is: Correct Answer: NO\u2082 Explanation: Oxidation numbers are used to keep track of the transfer of electrons in chemical compounds. In most compounds, oxygen typically has an oxidation number of -2. However, there are exceptions based on [&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-28251","post","type-post","status-publish","format-standard","hentry","category-quiz-questions"],"_links":{"self":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/28251","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=28251"}],"version-history":[{"count":1,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/28251\/revisions"}],"predecessor-version":[{"id":28253,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/28251\/revisions\/28253"}],"wp:attachment":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/media?parent=28251"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/categories?post=28251"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/tags?post=28251"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}