{"id":85189,"date":"2025-06-01T03:07:14","date_gmt":"2025-06-01T03:07:14","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=85189"},"modified":"2025-06-01T03:07:14","modified_gmt":"2025-06-01T03:07:14","slug":"when-we-heat-lead-nitrate-pbno%e2%82%83%e2%82%82-in-a-boiling-tube-we-observe-the","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/when-we-heat-lead-nitrate-pbno%e2%82%83%e2%82%82-in-a-boiling-tube-we-observe-the\/","title":{"rendered":"When we heat lead nitrate [Pb(NO\u2083)\u2082] in a boiling tube, we observe the"},"content":{"rendered":"

When we heat lead nitrate [Pb(NO\u2083)\u2082] in a boiling tube, we observe the emission of brown fumes. Which one of the following is the brown gas ?<\/p>\n

[amp_mcq option1=”NO” option2=”N\u2082O\u2082” option3=”NO\u2083” option4=”NO\u2082” correct=”option4″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC CDS-1 – 2021<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nWhen lead nitrate [Pb(NO\u2083)\u2082] is heated, it undergoes thermal decomposition, producing lead(II) oxide (PbO), oxygen gas (O\u2082), and nitrogen dioxide gas (NO\u2082). The brown fumes observed are due to nitrogen dioxide (NO\u2082).
\n<\/section>\n
\n– The balanced chemical equation for the decomposition of lead nitrate is: 2Pb(NO\u2083)\u2082(s) \u2192 2PbO(s) + 4NO\u2082(g) + O\u2082(g).
\n– Nitrogen dioxide (NO\u2082) is a toxic, reddish-brown gas.
\n<\/section>\n
\n– Nitrogen monoxide (NO) is a colourless gas.
\n– N\u2082O\u2082 is a dimer of NO, and while related to nitrogen oxides, it is not the species responsible for the prominent brown fumes in this decomposition.
\n– NO\u2083 is a highly reactive radical and not the stable product gas observed as brown fumes.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

When we heat lead nitrate [Pb(NO\u2083)\u2082] in a boiling tube, we observe the emission of brown fumes. Which one of the following is the brown gas ? [amp_mcq option1=”NO” option2=”N\u2082O\u2082” option3=”NO\u2083” option4=”NO\u2082” correct=”option4″] This question was previously asked in UPSC CDS-1 – 2021 Download PDFAttempt Online When lead nitrate [Pb(NO\u2083)\u2082] is heated, it undergoes thermal … <\/p>\n

Detailed SolutionWhen we heat lead nitrate [Pb(NO\u2083)\u2082] in a boiling tube, we observe the<\/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":[1110,1096,1239],"class_list":["post-85189","post","type-post","status-publish","format-standard","hentry","category-upsc-cds-1","tag-1110","tag-chemistry","tag-inorganic-chemistry","no-featured-image-padding"],"yoast_head":"\nWhen we heat lead nitrate [Pb(NO\u2083)\u2082] in a boiling tube, we observe the<\/title>\n<meta name=\"description\" content=\"When lead nitrate [Pb(NO\u2083)\u2082] is heated, it undergoes thermal decomposition, producing lead(II) oxide (PbO), oxygen gas (O\u2082), and nitrogen dioxide gas (NO\u2082). The brown fumes observed are due to nitrogen dioxide (NO\u2082). - The balanced chemical equation for the decomposition of lead nitrate is: 2Pb(NO\u2083)\u2082(s) \u2192 2PbO(s) + 4NO\u2082(g) + O\u2082(g). - Nitrogen dioxide (NO\u2082) is a toxic, reddish-brown gas.\" \/>\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\/when-we-heat-lead-nitrate-pbno\u2083\u2082-in-a-boiling-tube-we-observe-the\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"When we heat lead nitrate [Pb(NO\u2083)\u2082] in a boiling tube, we observe the\" \/>\n<meta property=\"og:description\" content=\"When lead nitrate [Pb(NO\u2083)\u2082] is heated, it undergoes thermal decomposition, producing lead(II) oxide (PbO), oxygen gas (O\u2082), and nitrogen dioxide gas (NO\u2082). The brown fumes observed are due to nitrogen dioxide (NO\u2082). - The balanced chemical equation for the decomposition of lead nitrate is: 2Pb(NO\u2083)\u2082(s) \u2192 2PbO(s) + 4NO\u2082(g) + O\u2082(g). - Nitrogen dioxide (NO\u2082) is a toxic, reddish-brown gas.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/when-we-heat-lead-nitrate-pbno\u2083\u2082-in-a-boiling-tube-we-observe-the\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T03:07:14+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=\"1 minute\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"When we heat lead nitrate [Pb(NO\u2083)\u2082] in a boiling tube, we observe the","description":"When lead nitrate [Pb(NO\u2083)\u2082] is heated, it undergoes thermal decomposition, producing lead(II) oxide (PbO), oxygen gas (O\u2082), and nitrogen dioxide gas (NO\u2082). The brown fumes observed are due to nitrogen dioxide (NO\u2082). - The balanced chemical equation for the decomposition of lead nitrate is: 2Pb(NO\u2083)\u2082(s) \u2192 2PbO(s) + 4NO\u2082(g) + O\u2082(g). - Nitrogen dioxide (NO\u2082) is a toxic, reddish-brown gas.","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\/when-we-heat-lead-nitrate-pbno\u2083\u2082-in-a-boiling-tube-we-observe-the\/","og_locale":"en_US","og_type":"article","og_title":"When we heat lead nitrate [Pb(NO\u2083)\u2082] in a boiling tube, we observe the","og_description":"When lead nitrate [Pb(NO\u2083)\u2082] is heated, it undergoes thermal decomposition, producing lead(II) oxide (PbO), oxygen gas (O\u2082), and nitrogen dioxide gas (NO\u2082). The brown fumes observed are due to nitrogen dioxide (NO\u2082). - The balanced chemical equation for the decomposition of lead nitrate is: 2Pb(NO\u2083)\u2082(s) \u2192 2PbO(s) + 4NO\u2082(g) + O\u2082(g). - Nitrogen dioxide (NO\u2082) is a toxic, reddish-brown gas.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/when-we-heat-lead-nitrate-pbno\u2083\u2082-in-a-boiling-tube-we-observe-the\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T03:07:14+00:00","author":"rawan239","twitter_card":"summary_large_image","twitter_misc":{"Written by":"rawan239","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/exam.pscnotes.com\/mcq\/when-we-heat-lead-nitrate-pbno%e2%82%83%e2%82%82-in-a-boiling-tube-we-observe-the\/","url":"https:\/\/exam.pscnotes.com\/mcq\/when-we-heat-lead-nitrate-pbno%e2%82%83%e2%82%82-in-a-boiling-tube-we-observe-the\/","name":"When we heat lead nitrate [Pb(NO\u2083)\u2082] in a boiling tube, we observe the","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T03:07:14+00:00","dateModified":"2025-06-01T03:07:14+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"When lead nitrate [Pb(NO\u2083)\u2082] is heated, it undergoes thermal decomposition, producing lead(II) oxide (PbO), oxygen gas (O\u2082), and nitrogen dioxide gas (NO\u2082). 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