{"id":87870,"date":"2025-06-01T06:56:01","date_gmt":"2025-06-01T06:56:01","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=87870"},"modified":"2025-06-01T06:56:01","modified_gmt":"2025-06-01T06:56:01","slug":"which-one-of-the-following-reactions-is-an-example-of-decomposition","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-reactions-is-an-example-of-decomposition\/","title":{"rendered":"Which one of the following reactions is an example of decomposition"},"content":{"rendered":"

Which one of the following reactions is an example of decomposition reaction?<\/p>\n

[amp_mcq option1=”CH\u2084(g) + 2O\u2082(g) \u2192 CO\u2082(g) + 2H\u2082O(g)” option2=”2AgCl(s) Sunlight \u2192 2Ag(s) + Cl\u2082(g)” option3=”CuO + H\u2082 Heat \u2192 Cu + H\u2082O” option4=”Fe(s) + CuSO\u2084(aq) \u2192 FeSO\u2084(aq) + Cu(s)” correct=”option2″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC NDA-1 – 2022<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nThe correct option is B.
\n<\/section>\n
\nA decomposition reaction is a reaction in which a single compound breaks down into two or more simpler substances.
\n<\/section>\n
\nOption A is a combustion reaction, where a substance reacts rapidly with oxygen to produce heat and light.
\nOption B, $2\\text{AgCl(s)} \\text{ Sunlight} \\rightarrow 2\\text{Ag(s)} + \\text{Cl}_2\\text{(g)}$, shows silver chloride (a single compound) breaking down into silver and chlorine (simpler substances) upon exposure to sunlight. This is a classic example of photolytic decomposition.
\nOption C is a reduction reaction, specifically the reduction of copper(II) oxide by hydrogen.
\nOption D is a displacement reaction, where iron displaces copper from copper sulphate solution.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Which one of the following reactions is an example of decomposition reaction? [amp_mcq option1=”CH\u2084(g) + 2O\u2082(g) \u2192 CO\u2082(g) + 2H\u2082O(g)” option2=”2AgCl(s) Sunlight \u2192 2Ag(s) + Cl\u2082(g)” option3=”CuO + H\u2082 Heat \u2192 Cu + H\u2082O” option4=”Fe(s) + CuSO\u2084(aq) \u2192 FeSO\u2084(aq) + Cu(s)” correct=”option2″] This question was previously asked in UPSC NDA-1 – 2022 Download PDFAttempt Online … <\/p>\n

Detailed SolutionWhich one of the following reactions is an example of decomposition<\/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":[1108,1096,1155],"class_list":["post-87870","post","type-post","status-publish","format-standard","hentry","category-upsc-nda-1","tag-1108","tag-chemistry","tag-physical-and-chemical-changes-solution","no-featured-image-padding"],"yoast_head":"\nWhich one of the following reactions is an example of decomposition<\/title>\n<meta name=\"description\" content=\"The correct option is B. A decomposition reaction is a reaction in which a single compound breaks down into two or more simpler substances.\" \/>\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-reactions-is-an-example-of-decomposition\/\" \/>\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 reactions is an example of decomposition\" \/>\n<meta property=\"og:description\" content=\"The correct option is B. 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