{"id":88534,"date":"2025-06-01T07:14:08","date_gmt":"2025-06-01T07:14:08","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=88534"},"modified":"2025-06-01T07:14:08","modified_gmt":"2025-06-01T07:14:08","slug":"which-one-of-the-following-compounds-does-not-exhibit-a-different-oxid","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-compounds-does-not-exhibit-a-different-oxid\/","title":{"rendered":"Which one of the following compounds does not exhibit a different oxid"},"content":{"rendered":"

Which one of the following compounds does not exhibit a different oxidation number of the same element?<\/p>\n

[amp_mcq option1=”Pb\u2083O\u2084” option2=”Fe\u2083O\u2084” option3=”Fe\u2082O\u2083” option4=”Mn\u2083O\u2084” correct=”option3″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC NDA-2 – 2019<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nThe correct option is C) Fe\u2082O\u2083. In Fe\u2082O\u2083, iron exists in only one oxidation state.
\n<\/section>\n
\nWe need to determine the oxidation state of the metal element in each compound:
\nA) Pb\u2083O\u2084 is a mixed oxide, often written as 2PbO\u00b7PbO\u2082. In PbO, O is -2, so Pb is +2. In PbO\u2082, O is -2 (total -4 for 2 O atoms), so Pb is +4. Lead has oxidation states +2 and +4 in Pb\u2083O\u2084.
\nB) Fe\u2083O\u2084 is a mixed oxide, FeO\u00b7Fe\u2082O\u2083. In FeO, O is -2, so Fe is +2. In Fe\u2082O\u2083, O is -2 (total -6 for 3 O atoms), so 2 Fe atoms are +6, meaning each Fe is +3. Iron has oxidation states +2 and +3 in Fe\u2083O\u2084.
\nC) Fe\u2082O\u2083: Assuming oxygen is -2, the total charge from 3 oxygen atoms is 3 * (-2) = -6. For the compound to be neutral, the total charge from 2 iron atoms must be +6. Thus, the oxidation state of each Fe atom is +6 \/ 2 = +3. All iron atoms in Fe\u2082O\u2083 are in the +3 oxidation state.
\nD) Mn\u2083O\u2084 is a mixed oxide, MnO\u00b7Mn\u2082O\u2083. In MnO, O is -2, so Mn is +2. In Mn\u2082O\u2083, O is -2 (total -6 for 3 O atoms), so 2 Mn atoms are +6, meaning each Mn is +3. Manganese has oxidation states +2 and +3 in Mn\u2083O\u2084.
\n<\/section>\n
\nMixed oxides like Pb\u2083O\u2084, Fe\u2083O\u2084, and Mn\u2083O\u2084 contain the metal element in more than one oxidation state combined within the same compound structure. Simple binary oxides like Fe\u2082O\u2083 (or FeO, FeO\u2082, etc.) typically have the metal in a single oxidation state throughout the compound.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Which one of the following compounds does not exhibit a different oxidation number of the same element? [amp_mcq option1=”Pb\u2083O\u2084” option2=”Fe\u2083O\u2084” option3=”Fe\u2082O\u2083” option4=”Mn\u2083O\u2084” correct=”option3″] This question was previously asked in UPSC NDA-2 – 2019 Download PDFAttempt Online The correct option is C) Fe\u2082O\u2083. In Fe\u2082O\u2083, iron exists in only one oxidation state. We need to determine … <\/p>\n

Detailed SolutionWhich one of the following compounds does not exhibit a different oxid<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1094],"tags":[1119,1096,1239],"class_list":["post-88534","post","type-post","status-publish","format-standard","hentry","category-upsc-nda-2","tag-1119","tag-chemistry","tag-inorganic-chemistry","no-featured-image-padding"],"yoast_head":"\nWhich one of the following compounds does not exhibit a different oxid<\/title>\n<meta name=\"description\" content=\"The correct option is C) Fe\u2082O\u2083. In Fe\u2082O\u2083, iron exists in only one oxidation state. We need to determine the oxidation state of the metal element in each compound: A) Pb\u2083O\u2084 is a mixed oxide, often written as 2PbO\u00b7PbO\u2082. In PbO, O is -2, so Pb is +2. In PbO\u2082, O is -2 (total -4 for 2 O atoms), so Pb is +4. Lead has oxidation states +2 and +4 in Pb\u2083O\u2084. B) Fe\u2083O\u2084 is a mixed oxide, FeO\u00b7Fe\u2082O\u2083. In FeO, O is -2, so Fe is +2. In Fe\u2082O\u2083, O is -2 (total -6 for 3 O atoms), so 2 Fe atoms are +6, meaning each Fe is +3. Iron has oxidation states +2 and +3 in Fe\u2083O\u2084. C) Fe\u2082O\u2083: Assuming oxygen is -2, the total charge from 3 oxygen atoms is 3 * (-2) = -6. For the compound to be neutral, the total charge from 2 iron atoms must be +6. Thus, the oxidation state of each Fe atom is +6 \/ 2 = +3. All iron atoms in Fe\u2082O\u2083 are in the +3 oxidation state. D) Mn\u2083O\u2084 is a mixed oxide, MnO\u00b7Mn\u2082O\u2083. In MnO, O is -2, so Mn is +2. In Mn\u2082O\u2083, O is -2 (total -6 for 3 O atoms), so 2 Mn atoms are +6, meaning each Mn is +3. Manganese has oxidation states +2 and +3 in Mn\u2083O\u2084.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-compounds-does-not-exhibit-a-different-oxid\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Which one of the following compounds does not exhibit a different oxid\" \/>\n<meta property=\"og:description\" content=\"The correct option is C) Fe\u2082O\u2083. In Fe\u2082O\u2083, iron exists in only one oxidation state. We need to determine the oxidation state of the metal element in each compound: A) Pb\u2083O\u2084 is a mixed oxide, often written as 2PbO\u00b7PbO\u2082. In PbO, O is -2, so Pb is +2. In PbO\u2082, O is -2 (total -4 for 2 O atoms), so Pb is +4. Lead has oxidation states +2 and +4 in Pb\u2083O\u2084. B) Fe\u2083O\u2084 is a mixed oxide, FeO\u00b7Fe\u2082O\u2083. In FeO, O is -2, so Fe is +2. In Fe\u2082O\u2083, O is -2 (total -6 for 3 O atoms), so 2 Fe atoms are +6, meaning each Fe is +3. Iron has oxidation states +2 and +3 in Fe\u2083O\u2084. C) Fe\u2082O\u2083: Assuming oxygen is -2, the total charge from 3 oxygen atoms is 3 * (-2) = -6. For the compound to be neutral, the total charge from 2 iron atoms must be +6. Thus, the oxidation state of each Fe atom is +6 \/ 2 = +3. All iron atoms in Fe\u2082O\u2083 are in the +3 oxidation state. D) Mn\u2083O\u2084 is a mixed oxide, MnO\u00b7Mn\u2082O\u2083. In MnO, O is -2, so Mn is +2. In Mn\u2082O\u2083, O is -2 (total -6 for 3 O atoms), so 2 Mn atoms are +6, meaning each Mn is +3. Manganese has oxidation states +2 and +3 in Mn\u2083O\u2084.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-compounds-does-not-exhibit-a-different-oxid\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T07:14:08+00:00\" \/>\n<meta name=\"author\" content=\"rawan239\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"rawan239\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Which one of the following compounds does not exhibit a different oxid","description":"The correct option is C) Fe\u2082O\u2083. In Fe\u2082O\u2083, iron exists in only one oxidation state. We need to determine the oxidation state of the metal element in each compound: A) Pb\u2083O\u2084 is a mixed oxide, often written as 2PbO\u00b7PbO\u2082. In PbO, O is -2, so Pb is +2. In PbO\u2082, O is -2 (total -4 for 2 O atoms), so Pb is +4. Lead has oxidation states +2 and +4 in Pb\u2083O\u2084. B) Fe\u2083O\u2084 is a mixed oxide, FeO\u00b7Fe\u2082O\u2083. In FeO, O is -2, so Fe is +2. In Fe\u2082O\u2083, O is -2 (total -6 for 3 O atoms), so 2 Fe atoms are +6, meaning each Fe is +3. Iron has oxidation states +2 and +3 in Fe\u2083O\u2084. C) Fe\u2082O\u2083: Assuming oxygen is -2, the total charge from 3 oxygen atoms is 3 * (-2) = -6. For the compound to be neutral, the total charge from 2 iron atoms must be +6. Thus, the oxidation state of each Fe atom is +6 \/ 2 = +3. All iron atoms in Fe\u2082O\u2083 are in the +3 oxidation state. D) Mn\u2083O\u2084 is a mixed oxide, MnO\u00b7Mn\u2082O\u2083. In MnO, O is -2, so Mn is +2. In Mn\u2082O\u2083, O is -2 (total -6 for 3 O atoms), so 2 Mn atoms are +6, meaning each Mn is +3. Manganese has oxidation states +2 and +3 in Mn\u2083O\u2084.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-compounds-does-not-exhibit-a-different-oxid\/","og_locale":"en_US","og_type":"article","og_title":"Which one of the following compounds does not exhibit a different oxid","og_description":"The correct option is C) Fe\u2082O\u2083. In Fe\u2082O\u2083, iron exists in only one oxidation state. We need to determine the oxidation state of the metal element in each compound: A) Pb\u2083O\u2084 is a mixed oxide, often written as 2PbO\u00b7PbO\u2082. In PbO, O is -2, so Pb is +2. In PbO\u2082, O is -2 (total -4 for 2 O atoms), so Pb is +4. Lead has oxidation states +2 and +4 in Pb\u2083O\u2084. B) Fe\u2083O\u2084 is a mixed oxide, FeO\u00b7Fe\u2082O\u2083. In FeO, O is -2, so Fe is +2. In Fe\u2082O\u2083, O is -2 (total -6 for 3 O atoms), so 2 Fe atoms are +6, meaning each Fe is +3. Iron has oxidation states +2 and +3 in Fe\u2083O\u2084. C) Fe\u2082O\u2083: Assuming oxygen is -2, the total charge from 3 oxygen atoms is 3 * (-2) = -6. For the compound to be neutral, the total charge from 2 iron atoms must be +6. Thus, the oxidation state of each Fe atom is +6 \/ 2 = +3. All iron atoms in Fe\u2082O\u2083 are in the +3 oxidation state. D) Mn\u2083O\u2084 is a mixed oxide, MnO\u00b7Mn\u2082O\u2083. In MnO, O is -2, so Mn is +2. In Mn\u2082O\u2083, O is -2 (total -6 for 3 O atoms), so 2 Mn atoms are +6, meaning each Mn is +3. Manganese has oxidation states +2 and +3 in Mn\u2083O\u2084.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-compounds-does-not-exhibit-a-different-oxid\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T07:14:08+00:00","author":"rawan239","twitter_card":"summary_large_image","twitter_misc":{"Written by":"rawan239","Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-compounds-does-not-exhibit-a-different-oxid\/","url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-compounds-does-not-exhibit-a-different-oxid\/","name":"Which one of the following compounds does not exhibit a different oxid","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T07:14:08+00:00","dateModified":"2025-06-01T07:14:08+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"The correct option is C) Fe\u2082O\u2083. In Fe\u2082O\u2083, iron exists in only one oxidation state. We need to determine the oxidation state of the metal element in each compound: A) Pb\u2083O\u2084 is a mixed oxide, often written as 2PbO\u00b7PbO\u2082. In PbO, O is -2, so Pb is +2. In PbO\u2082, O is -2 (total -4 for 2 O atoms), so Pb is +4. Lead has oxidation states +2 and +4 in Pb\u2083O\u2084. B) Fe\u2083O\u2084 is a mixed oxide, FeO\u00b7Fe\u2082O\u2083. In FeO, O is -2, so Fe is +2. In Fe\u2082O\u2083, O is -2 (total -6 for 3 O atoms), so 2 Fe atoms are +6, meaning each Fe is +3. Iron has oxidation states +2 and +3 in Fe\u2083O\u2084. C) Fe\u2082O\u2083: Assuming oxygen is -2, the total charge from 3 oxygen atoms is 3 * (-2) = -6. For the compound to be neutral, the total charge from 2 iron atoms must be +6. Thus, the oxidation state of each Fe atom is +6 \/ 2 = +3. All iron atoms in Fe\u2082O\u2083 are in the +3 oxidation state. D) Mn\u2083O\u2084 is a mixed oxide, MnO\u00b7Mn\u2082O\u2083. In MnO, O is -2, so Mn is +2. In Mn\u2082O\u2083, O is -2 (total -6 for 3 O atoms), so 2 Mn atoms are +6, meaning each Mn is +3. Manganese has oxidation states +2 and +3 in Mn\u2083O\u2084.","breadcrumb":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-compounds-does-not-exhibit-a-different-oxid\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-compounds-does-not-exhibit-a-different-oxid\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-compounds-does-not-exhibit-a-different-oxid\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/exam.pscnotes.com\/mcq\/"},{"@type":"ListItem","position":2,"name":"UPSC NDA-2","item":"https:\/\/exam.pscnotes.com\/mcq\/category\/upsc-nda-2\/"},{"@type":"ListItem","position":3,"name":"Which one of the following compounds does not exhibit a different oxid"}]},{"@type":"WebSite","@id":"https:\/\/exam.pscnotes.com\/mcq\/#website","url":"https:\/\/exam.pscnotes.com\/mcq\/","name":"MCQ and Quiz for Exams","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/exam.pscnotes.com\/mcq\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209","name":"rawan239","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/761a7274f9cce048fa5b921221e7934820d74514df93ef195a9d22af0c1c9001?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/761a7274f9cce048fa5b921221e7934820d74514df93ef195a9d22af0c1c9001?s=96&d=mm&r=g","caption":"rawan239"},"sameAs":["https:\/\/exam.pscnotes.com"],"url":"https:\/\/exam.pscnotes.com\/mcq\/author\/rawan239\/"}]}},"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/88534","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/comments?post=88534"}],"version-history":[{"count":0,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/88534\/revisions"}],"wp:attachment":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/media?parent=88534"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/categories?post=88534"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/tags?post=88534"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}