{"id":87680,"date":"2025-06-01T06:51:08","date_gmt":"2025-06-01T06:51:08","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=87680"},"modified":"2025-06-01T06:51:08","modified_gmt":"2025-06-01T06:51:08","slug":"on-exposure-to-moist-air-copper-gains-a-green-coat-on-its-surface-due","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/on-exposure-to-moist-air-copper-gains-a-green-coat-on-its-surface-due\/","title":{"rendered":"On exposure to moist air, copper gains a green coat on its surface due"},"content":{"rendered":"

On exposure to moist air, copper gains a green coat on its surface due to formation of which one of the following compounds ?<\/p>\n

[amp_mcq option1=”Copper carbonate” option2=”Copper oxide” option3=”Copper sulphate” option4=”Copper nitrate” correct=”option1″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC NDA-1 – 2019<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nOn exposure to moist air, copper gains a green coat on its surface due to the formation of copper carbonate (more specifically, basic copper carbonate).
\n<\/section>\n
\nWhen copper is exposed to moist air containing carbon dioxide, it reacts to form a complex mixture of copper carbonates and hydroxides, often referred to as patina. The simplified reaction involves copper reacting with oxygen, water, and carbon dioxide to form basic copper carbonate, typically Cu\u2082(OH)\u2082CO\u2083 (malachite), which has a characteristic green colour.
\n<\/section>\n
\nThe reaction is often represented as: 2Cu(s) + H\u2082O(g) + CO\u2082(g) + O\u2082(g) \u2192 Cu\u2082(OH)\u2082CO\u2083(s) (basic copper carbonate). While the coating is technically a basic carbonate, “Copper carbonate” (referring to the presence of the carbonate group) is the closest option provided. Pure copper(II) carbonate (CuCO\u2083) is also green, but the patina is usually a mixture of CuCO\u2083 and Cu(OH)\u2082.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

On exposure to moist air, copper gains a green coat on its surface due to formation of which one of the following compounds ? [amp_mcq option1=”Copper carbonate” option2=”Copper oxide” option3=”Copper sulphate” option4=”Copper nitrate” correct=”option1″] This question was previously asked in UPSC NDA-1 – 2019 Download PDFAttempt Online On exposure to moist air, copper gains a … <\/p>\n

Detailed SolutionOn exposure to moist air, copper gains a green coat on its surface due<\/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":[1093],"tags":[1119,1096,1109],"class_list":["post-87680","post","type-post","status-publish","format-standard","hentry","category-upsc-nda-1","tag-1119","tag-chemistry","tag-metals-minerals-ores-properties-uses","no-featured-image-padding"],"yoast_head":"\nOn exposure to moist air, copper gains a green coat on its surface due<\/title>\n<meta name=\"description\" content=\"On exposure to moist air, copper gains a green coat on its surface due to the formation of copper carbonate (more specifically, basic copper carbonate). When copper is exposed to moist air containing carbon dioxide, it reacts to form a complex mixture of copper carbonates and hydroxides, often referred to as patina. The simplified reaction involves copper reacting with oxygen, water, and carbon dioxide to form basic copper carbonate, typically Cu\u2082(OH)\u2082CO\u2083 (malachite), which has a characteristic green colour.\" \/>\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\/on-exposure-to-moist-air-copper-gains-a-green-coat-on-its-surface-due\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"On exposure to moist air, copper gains a green coat on its surface due\" \/>\n<meta property=\"og:description\" content=\"On exposure to moist air, copper gains a green coat on its surface due to the formation of copper carbonate (more specifically, basic copper carbonate). When copper is exposed to moist air containing carbon dioxide, it reacts to form a complex mixture of copper carbonates and hydroxides, often referred to as patina. The simplified reaction involves copper reacting with oxygen, water, and carbon dioxide to form basic copper carbonate, typically Cu\u2082(OH)\u2082CO\u2083 (malachite), which has a characteristic green colour.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/on-exposure-to-moist-air-copper-gains-a-green-coat-on-its-surface-due\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T06:51:08+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=\"1 minute\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"On exposure to moist air, copper gains a green coat on its surface due","description":"On exposure to moist air, copper gains a green coat on its surface due to the formation of copper carbonate (more specifically, basic copper carbonate). 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When copper is exposed to moist air containing carbon dioxide, it reacts to form a complex mixture of copper carbonates and hydroxides, often referred to as patina. 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When copper is exposed to moist air containing carbon dioxide, it reacts to form a complex mixture of copper carbonates and hydroxides, often referred to as patina. 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