{"id":86138,"date":"2025-06-01T03:38:30","date_gmt":"2025-06-01T03:38:30","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=86138"},"modified":"2025-06-01T03:38:30","modified_gmt":"2025-06-01T03:38:30","slug":"silver-articles-turn-black-when-kept-in-the-open-for-longer-time-due-t","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/silver-articles-turn-black-when-kept-in-the-open-for-longer-time-due-t\/","title":{"rendered":"Silver articles turn black when kept in the open for longer time due t"},"content":{"rendered":"

Silver articles turn black when kept in the open for longer time due to the formation of<\/p>\n

[amp_mcq option1=”H\u2082S” option2=”AgS” option3=”AgSO\u2084” option4=”Ag\u2082S” correct=”option4″]<\/p>\n

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This question was previously asked in<\/div>\n
UPSC CDS-2 – 2020<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nSilver articles tarnish and turn black when exposed to the air for a prolonged period. This tarnishing is primarily due to the reaction of silver (Ag) with hydrogen sulfide (H\u2082S) gas present in the atmosphere (often produced by the decomposition of organic matter or industrial pollution). This reaction forms a layer of black silver sulfide (Ag\u2082S) on the surface of the silver article. The overall reaction is 2Ag + H\u2082S \u2192 Ag\u2082S + H\u2082.
\n<\/section>\n
\nSilver tarnish is caused by the formation of silver sulfide (Ag\u2082S) through the reaction of silver with hydrogen sulfide in the air.
\n<\/section>\n
\nH\u2082S is the reactant from the air. AgS is not the correct chemical formula for silver sulfide (silver has a +1 charge, sulfide has a -2 charge, so Ag\u2082S is formed). AgSO\u2084 is silver sulfate, which would typically be formed by a reaction with sulfuric acid or sulfates, not the common cause of black tarnish in air. The black deposit is definitively silver sulfide (Ag\u2082S).
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Silver articles turn black when kept in the open for longer time due to the formation of [amp_mcq option1=”H\u2082S” option2=”AgS” option3=”AgSO\u2084” option4=”Ag\u2082S” correct=”option4″] This question was previously asked in UPSC CDS-2 – 2020 Download PDFAttempt Online Silver articles tarnish and turn black when exposed to the air for a prolonged period. This tarnishing is primarily … <\/p>\n

Detailed SolutionSilver articles turn black when kept in the open for longer time due t<\/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":[1088],"tags":[1288,1096,1109],"class_list":["post-86138","post","type-post","status-publish","format-standard","hentry","category-upsc-cds-2","tag-1288","tag-chemistry","tag-metals-minerals-ores-properties-uses","no-featured-image-padding"],"yoast_head":"\nSilver articles turn black when kept in the open for longer time due t<\/title>\n<meta name=\"description\" content=\"Silver articles tarnish and turn black when exposed to the air for a prolonged period. This tarnishing is primarily due to the reaction of silver (Ag) with hydrogen sulfide (H\u2082S) gas present in the atmosphere (often produced by the decomposition of organic matter or industrial pollution). This reaction forms a layer of black silver sulfide (Ag\u2082S) on the surface of the silver article. The overall reaction is 2Ag + H\u2082S \u2192 Ag\u2082S + H\u2082. Silver tarnish is caused by the formation of silver sulfide (Ag\u2082S) through the reaction of silver with hydrogen sulfide in the air.\" \/>\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\/silver-articles-turn-black-when-kept-in-the-open-for-longer-time-due-t\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Silver articles turn black when kept in the open for longer time due t\" \/>\n<meta property=\"og:description\" content=\"Silver articles tarnish and turn black when exposed to the air for a prolonged period. This tarnishing is primarily due to the reaction of silver (Ag) with hydrogen sulfide (H\u2082S) gas present in the atmosphere (often produced by the decomposition of organic matter or industrial pollution). This reaction forms a layer of black silver sulfide (Ag\u2082S) on the surface of the silver article. The overall reaction is 2Ag + H\u2082S \u2192 Ag\u2082S + H\u2082. Silver tarnish is caused by the formation of silver sulfide (Ag\u2082S) through the reaction of silver with hydrogen sulfide in the air.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/silver-articles-turn-black-when-kept-in-the-open-for-longer-time-due-t\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T03:38:30+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":"Silver articles turn black when kept in the open for longer time due t","description":"Silver articles tarnish and turn black when exposed to the air for a prolonged period. This tarnishing is primarily due to the reaction of silver (Ag) with hydrogen sulfide (H\u2082S) gas present in the atmosphere (often produced by the decomposition of organic matter or industrial pollution). This reaction forms a layer of black silver sulfide (Ag\u2082S) on the surface of the silver article. The overall reaction is 2Ag + H\u2082S \u2192 Ag\u2082S + H\u2082. Silver tarnish is caused by the formation of silver sulfide (Ag\u2082S) through the reaction of silver with hydrogen sulfide in the air.","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\/silver-articles-turn-black-when-kept-in-the-open-for-longer-time-due-t\/","og_locale":"en_US","og_type":"article","og_title":"Silver articles turn black when kept in the open for longer time due t","og_description":"Silver articles tarnish and turn black when exposed to the air for a prolonged period. This tarnishing is primarily due to the reaction of silver (Ag) with hydrogen sulfide (H\u2082S) gas present in the atmosphere (often produced by the decomposition of organic matter or industrial pollution). This reaction forms a layer of black silver sulfide (Ag\u2082S) on the surface of the silver article. The overall reaction is 2Ag + H\u2082S \u2192 Ag\u2082S + H\u2082. Silver tarnish is caused by the formation of silver sulfide (Ag\u2082S) through the reaction of silver with hydrogen sulfide in the air.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/silver-articles-turn-black-when-kept-in-the-open-for-longer-time-due-t\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T03:38:30+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\/silver-articles-turn-black-when-kept-in-the-open-for-longer-time-due-t\/","url":"https:\/\/exam.pscnotes.com\/mcq\/silver-articles-turn-black-when-kept-in-the-open-for-longer-time-due-t\/","name":"Silver articles turn black when kept in the open for longer time due t","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T03:38:30+00:00","dateModified":"2025-06-01T03:38:30+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"Silver articles tarnish and turn black when exposed to the air for a prolonged period. This tarnishing is primarily due to the reaction of silver (Ag) with hydrogen sulfide (H\u2082S) gas present in the atmosphere (often produced by the decomposition of organic matter or industrial pollution). This reaction forms a layer of black silver sulfide (Ag\u2082S) on the surface of the silver article. The overall reaction is 2Ag + H\u2082S \u2192 Ag\u2082S + H\u2082. 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