{"id":84775,"date":"2025-06-01T02:49:52","date_gmt":"2025-06-01T02:49:52","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=84775"},"modified":"2025-06-01T02:49:52","modified_gmt":"2025-06-01T02:49:52","slug":"consider-the-following-constituent-gases-of-the-atmosphere-1-argo","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/consider-the-following-constituent-gases-of-the-atmosphere-1-argo\/","title":{"rendered":"Consider the following constituent gases of the atmosphere :\n  1. Argo"},"content":{"rendered":"<p>Consider the following constituent gases of the atmosphere :<\/p>\n<ul>\n<li>1. Argon<\/li>\n<li>2. Neon<\/li>\n<li>3. Helium<\/li>\n<li>4. Carbon dioxide<\/li>\n<\/ul>\n<p>Which one of the following is the correct ascending sequence of the above gases in terms of the volume percentage?<\/p>\n<p>[amp_mcq option1=&#8221;1-3-2-4&#8243; option2=&#8221;1-4-2-3&#8243; option3=&#8221;4-2-3-1&#8243; option4=&#8221;2-4-1-3&#8243; correct=&#8221;option4&#8243;]<\/p>\n<div class=\"psc-box-pyq-exam-year-detail\">\n<div class=\"pyq-exam\">\n<div class=\"psc-heading\">This question was previously asked in<\/div>\n<div class=\"psc-title line-ellipsis\">UPSC CDS-1 &#8211; 2018<\/div>\n<\/div>\n<div class=\"pyq-exam-psc-buttons\"><a href=\"\/pyq\/pyq-upsc-cds-1-2018.pdf\" target=\"_blank\" class=\"psc-pdf-button\" rel=\"noopener\">Download PDF<\/a><a href=\"\/pyq-upsc-cds-1-2018\" target=\"_blank\" class=\"psc-attempt-button\" rel=\"noopener\">Attempt Online<\/a><\/div>\n<\/div>\n<section id=\"pyq-correct-answer\">\nThe question asks for the correct ascending sequence of atmospheric gases by volume percentage. Let&#8217;s list the approximate volume percentages of the given gases in dry air:<br \/>\n1. Argon (Ar): ~0.93%<br \/>\n2. Neon (Ne): ~0.0018%<br \/>\n3. Helium (He): ~0.0005%<br \/>\n4. Carbon dioxide (CO\u2082): ~0.04% (This value can slightly vary depending on the source\/year, but its relative position is stable).<br \/>\nThe correct ascending order by volume percentage is Helium (3) < Neon (2) < Carbon dioxide (4) < Argon (1). This corresponds to the sequence 3-2-4-1.\nLooking at the options provided:\nA) 1-3-2-4 (Ar, He, Ne, CO2) - Incorrect\nB) 1-4-2-3 (Ar, CO2, Ne, He) - This sequence (0.93%, 0.04%, 0.0018%, 0.0005%) represents the correct *descending* order of the gases.\nC) 4-2-3-1 (CO2, Ne, He, Ar) - Incorrect\nD) 2-4-1-3 (Ne, CO2, Ar, He) - Incorrect\nBased on standard scientific values, none of the options represent the correct ascending sequence (3-2-4-1). However, option B presents the correct descending sequence (1-4-2-3). It is highly probable that there is an error in the question asking for \"ascending\" instead of \"descending\", or a misprint in the options. Given that a forced choice from the options is required and B is the correct descending order, it is often the case in such flawed questions that the option matching the reverse order is the intended answer due to a mistake in the question phrasing. Assuming this likely error, we select B.\n<\/section>\n<section id=\"pyq-key-points\">\n&#8211; The major components of dry air are Nitrogen (~78%), Oxygen (~21%), and Argon (~0.93%).<br \/>\n&#8211; Carbon dioxide, Neon, and Helium are trace gases, present in much smaller quantities.<br \/>\n&#8211; The order of abundance for the given gases is Argon > Carbon dioxide > Neon > Helium.<br \/>\n<\/section>\n<section id=\"pyq-additional-information\">\nThe percentages of atmospheric gases are generally constant in the lower atmosphere, except for variable gases like water vapor and carbon dioxide. The exact percentage of CO2 has been increasing due to human activities, but its relative abundance compared to Ar, Ne, and He remains in the same order.<br \/>\n<\/section>\n","protected":false},"excerpt":{"rendered":"<p>Consider the following constituent gases of the atmosphere : 1. Argon 2. Neon 3. Helium 4. Carbon dioxide Which one of the following is the correct ascending sequence of the above gases in terms of the volume percentage? [amp_mcq option1=&#8221;1-3-2-4&#8243; option2=&#8221;1-4-2-3&#8243; option3=&#8221;4-2-3-1&#8243; option4=&#8221;2-4-1-3&#8243; correct=&#8221;option4&#8243;] This question was previously asked in UPSC CDS-1 &#8211; 2018 Download &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Consider the following constituent gases of the atmosphere :\n  1. Argo\" class=\"read-more button\" href=\"https:\/\/exam.pscnotes.com\/mcq\/consider-the-following-constituent-gases-of-the-atmosphere-1-argo\/#more-84775\">Detailed Solution<span class=\"screen-reader-text\">Consider the following constituent gases of the atmosphere :<br \/>\n  1. Argo<\/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":[1087],"tags":[1114,1107,1106],"class_list":["post-84775","post","type-post","status-publish","format-standard","hentry","category-upsc-cds-1","tag-1114","tag-the-atmosphere","tag-world-and-physical-geography","no-featured-image-padding"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.2 (Yoast SEO v23.3) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Consider the following constituent gases of the atmosphere :  1. Argo<\/title>\n<meta name=\"description\" content=\"The question asks for the correct ascending sequence of atmospheric gases by volume percentage. Let&#039;s list the approximate volume percentages of the given gases in dry air: 1. Argon (Ar): ~0.93% 2. Neon (Ne): ~0.0018% 3. Helium (He): ~0.0005% 4. Carbon dioxide (CO\u2082): ~0.04% (This value can slightly vary depending on the source\/year, but its relative position is stable). The correct ascending order by volume percentage is Helium (3) &lt; Neon (2) &lt; Carbon dioxide (4) &lt; Argon (1). This corresponds to the sequence 3-2-4-1. Looking at the options provided: A) 1-3-2-4 (Ar, He, Ne, CO2) - Incorrect B) 1-4-2-3 (Ar, CO2, Ne, He) - This sequence (0.93%, 0.04%, 0.0018%, 0.0005%) represents the correct *descending* order of the gases. C) 4-2-3-1 (CO2, Ne, He, Ar) - Incorrect D) 2-4-1-3 (Ne, CO2, Ar, He) - Incorrect Based on standard scientific values, none of the options represent the correct ascending sequence (3-2-4-1). However, option B presents the correct descending sequence (1-4-2-3). It is highly probable that there is an error in the question asking for &quot;ascending&quot; instead of &quot;descending&quot;, or a misprint in the options. Given that a forced choice from the options is required and B is the correct descending order, it is often the case in such flawed questions that the option matching the reverse order is the intended answer due to a mistake in the question phrasing. Assuming this likely error, we select B. - The major components of dry air are Nitrogen (~78%), Oxygen (~21%), and Argon (~0.93%). - Carbon dioxide, Neon, and Helium are trace gases, present in much smaller quantities. - The order of abundance for the given gases is Argon &gt; Carbon dioxide &gt; Neon &gt; Helium.\" \/>\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\/consider-the-following-constituent-gases-of-the-atmosphere-1-argo\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Consider the following constituent gases of the atmosphere :  1. Argo\" \/>\n<meta property=\"og:description\" content=\"The question asks for the correct ascending sequence of atmospheric gases by volume percentage. Let&#039;s list the approximate volume percentages of the given gases in dry air: 1. Argon (Ar): ~0.93% 2. Neon (Ne): ~0.0018% 3. Helium (He): ~0.0005% 4. Carbon dioxide (CO\u2082): ~0.04% (This value can slightly vary depending on the source\/year, but its relative position is stable). The correct ascending order by volume percentage is Helium (3) &lt; Neon (2) &lt; Carbon dioxide (4) &lt; Argon (1). This corresponds to the sequence 3-2-4-1. Looking at the options provided: A) 1-3-2-4 (Ar, He, Ne, CO2) - Incorrect B) 1-4-2-3 (Ar, CO2, Ne, He) - This sequence (0.93%, 0.04%, 0.0018%, 0.0005%) represents the correct *descending* order of the gases. C) 4-2-3-1 (CO2, Ne, He, Ar) - Incorrect D) 2-4-1-3 (Ne, CO2, Ar, He) - Incorrect Based on standard scientific values, none of the options represent the correct ascending sequence (3-2-4-1). However, option B presents the correct descending sequence (1-4-2-3). It is highly probable that there is an error in the question asking for &quot;ascending&quot; instead of &quot;descending&quot;, or a misprint in the options. Given that a forced choice from the options is required and B is the correct descending order, it is often the case in such flawed questions that the option matching the reverse order is the intended answer due to a mistake in the question phrasing. Assuming this likely error, we select B. - The major components of dry air are Nitrogen (~78%), Oxygen (~21%), and Argon (~0.93%). - Carbon dioxide, Neon, and Helium are trace gases, present in much smaller quantities. - The order of abundance for the given gases is Argon &gt; Carbon dioxide &gt; Neon &gt; Helium.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/consider-the-following-constituent-gases-of-the-atmosphere-1-argo\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T02:49:52+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":"Consider the following constituent gases of the atmosphere :  1. Argo","description":"The question asks for the correct ascending sequence of atmospheric gases by volume percentage. Let's list the approximate volume percentages of the given gases in dry air: 1. Argon (Ar): ~0.93% 2. Neon (Ne): ~0.0018% 3. Helium (He): ~0.0005% 4. Carbon dioxide (CO\u2082): ~0.04% (This value can slightly vary depending on the source\/year, but its relative position is stable). The correct ascending order by volume percentage is Helium (3) &lt; Neon (2) &lt; Carbon dioxide (4) < Argon (1). This corresponds to the sequence 3-2-4-1. Looking at the options provided: A) 1-3-2-4 (Ar, He, Ne, CO2) - Incorrect B) 1-4-2-3 (Ar, CO2, Ne, He) - This sequence (0.93%, 0.04%, 0.0018%, 0.0005%) represents the correct *descending* order of the gases. C) 4-2-3-1 (CO2, Ne, He, Ar) - Incorrect D) 2-4-1-3 (Ne, CO2, Ar, He) - Incorrect Based on standard scientific values, none of the options represent the correct ascending sequence (3-2-4-1). However, option B presents the correct descending sequence (1-4-2-3). It is highly probable that there is an error in the question asking for \"ascending\" instead of \"descending\", or a misprint in the options. Given that a forced choice from the options is required and B is the correct descending order, it is often the case in such flawed questions that the option matching the reverse order is the intended answer due to a mistake in the question phrasing. Assuming this likely error, we select B. - The major components of dry air are Nitrogen (~78%), Oxygen (~21%), and Argon (~0.93%). - Carbon dioxide, Neon, and Helium are trace gases, present in much smaller quantities. - The order of abundance for the given gases is Argon > Carbon dioxide > Neon > Helium.","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\/consider-the-following-constituent-gases-of-the-atmosphere-1-argo\/","og_locale":"en_US","og_type":"article","og_title":"Consider the following constituent gases of the atmosphere :  1. Argo","og_description":"The question asks for the correct ascending sequence of atmospheric gases by volume percentage. Let's list the approximate volume percentages of the given gases in dry air: 1. Argon (Ar): ~0.93% 2. Neon (Ne): ~0.0018% 3. Helium (He): ~0.0005% 4. Carbon dioxide (CO\u2082): ~0.04% (This value can slightly vary depending on the source\/year, but its relative position is stable). The correct ascending order by volume percentage is Helium (3) &lt; Neon (2) &lt; Carbon dioxide (4) < Argon (1). This corresponds to the sequence 3-2-4-1. Looking at the options provided: A) 1-3-2-4 (Ar, He, Ne, CO2) - Incorrect B) 1-4-2-3 (Ar, CO2, Ne, He) - This sequence (0.93%, 0.04%, 0.0018%, 0.0005%) represents the correct *descending* order of the gases. C) 4-2-3-1 (CO2, Ne, He, Ar) - Incorrect D) 2-4-1-3 (Ne, CO2, Ar, He) - Incorrect Based on standard scientific values, none of the options represent the correct ascending sequence (3-2-4-1). However, option B presents the correct descending sequence (1-4-2-3). It is highly probable that there is an error in the question asking for \"ascending\" instead of \"descending\", or a misprint in the options. Given that a forced choice from the options is required and B is the correct descending order, it is often the case in such flawed questions that the option matching the reverse order is the intended answer due to a mistake in the question phrasing. Assuming this likely error, we select B. - The major components of dry air are Nitrogen (~78%), Oxygen (~21%), and Argon (~0.93%). - Carbon dioxide, Neon, and Helium are trace gases, present in much smaller quantities. - The order of abundance for the given gases is Argon > Carbon dioxide > Neon > Helium.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/consider-the-following-constituent-gases-of-the-atmosphere-1-argo\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T02:49:52+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\/consider-the-following-constituent-gases-of-the-atmosphere-1-argo\/","url":"https:\/\/exam.pscnotes.com\/mcq\/consider-the-following-constituent-gases-of-the-atmosphere-1-argo\/","name":"Consider the following constituent gases of the atmosphere : 1. Argo","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T02:49:52+00:00","dateModified":"2025-06-01T02:49:52+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"The question asks for the correct ascending sequence of atmospheric gases by volume percentage. Let's list the approximate volume percentages of the given gases in dry air: 1. Argon (Ar): ~0.93% 2. Neon (Ne): ~0.0018% 3. Helium (He): ~0.0005% 4. Carbon dioxide (CO\u2082): ~0.04% (This value can slightly vary depending on the source\/year, but its relative position is stable). The correct ascending order by volume percentage is Helium (3) &lt; Neon (2) &lt; Carbon dioxide (4) < Argon (1). This corresponds to the sequence 3-2-4-1. Looking at the options provided: A) 1-3-2-4 (Ar, He, Ne, CO2) - Incorrect B) 1-4-2-3 (Ar, CO2, Ne, He) - This sequence (0.93%, 0.04%, 0.0018%, 0.0005%) represents the correct *descending* order of the gases. C) 4-2-3-1 (CO2, Ne, He, Ar) - Incorrect D) 2-4-1-3 (Ne, CO2, Ar, He) - Incorrect Based on standard scientific values, none of the options represent the correct ascending sequence (3-2-4-1). However, option B presents the correct descending sequence (1-4-2-3). It is highly probable that there is an error in the question asking for \"ascending\" instead of \"descending\", or a misprint in the options. Given that a forced choice from the options is required and B is the correct descending order, it is often the case in such flawed questions that the option matching the reverse order is the intended answer due to a mistake in the question phrasing. Assuming this likely error, we select B. - The major components of dry air are Nitrogen (~78%), Oxygen (~21%), and Argon (~0.93%). - Carbon dioxide, Neon, and Helium are trace gases, present in much smaller quantities. - The order of abundance for the given gases is Argon > Carbon dioxide > Neon > Helium.","breadcrumb":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/consider-the-following-constituent-gases-of-the-atmosphere-1-argo\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/exam.pscnotes.com\/mcq\/consider-the-following-constituent-gases-of-the-atmosphere-1-argo\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/exam.pscnotes.com\/mcq\/consider-the-following-constituent-gases-of-the-atmosphere-1-argo\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/exam.pscnotes.com\/mcq\/"},{"@type":"ListItem","position":2,"name":"UPSC CDS-1","item":"https:\/\/exam.pscnotes.com\/mcq\/category\/upsc-cds-1\/"},{"@type":"ListItem","position":3,"name":"Consider the following constituent gases of the atmosphere : 1. Argo"}]},{"@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\/84775","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=84775"}],"version-history":[{"count":0,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/84775\/revisions"}],"wp:attachment":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/media?parent=84775"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/categories?post=84775"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/tags?post=84775"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}