{"id":90575,"date":"2025-06-01T10:31:18","date_gmt":"2025-06-01T10:31:18","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=90575"},"modified":"2025-06-01T10:31:18","modified_gmt":"2025-06-01T10:31:18","slug":"which-one-of-the-following-is-an-example-of-endothermic-reaction","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-an-example-of-endothermic-reaction\/","title":{"rendered":"Which one of the following is an example of endothermic reaction?"},"content":{"rendered":"

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

[amp_mcq option1=”CaO(s) + H\u2082O(l) \u2192 Ca(OH)\u2082(aq)” option2=”CaCO\u2083(s) \u2192 CaO(s) + CO\u2082(g)” option3=”C(s) + O\u2082(g) \u2192 CO\u2082(g)” option4=”CH\u2084(g) + 2O\u2082(g) \u2192 CO\u2082(g) + 2H\u2082O(l)” correct=”option2″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC CAPF – 2021<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nThe correct answer is B) CaCO\u2083(s) \u2192 CaO(s) + CO\u2082(g).
\n<\/section>\n
\nAn endothermic reaction is a reaction that absorbs heat from its surroundings.
\nA) CaO(s) + H\u2082O(l) \u2192 Ca(OH)\u2082(aq) (Slaking of lime) is a highly exothermic reaction, releasing significant heat.
\nB) CaCO\u2083(s) \u2192 CaO(s) + CO\u2082(g) (Decomposition of calcium carbonate) requires heating to occur, meaning it absorbs heat from the surroundings, making it an endothermic reaction.
\nC) C(s) + O\u2082(g) \u2192 CO\u2082(g) (Combustion of carbon) is an exothermic reaction, releasing heat and light.
\nD) CH\u2084(g) + 2O\u2082(g) \u2192 CO\u2082(g) + 2H\u2082O(l) (Combustion of methane) is an exothermic reaction, releasing a large amount of heat.
\n<\/section>\n
\nExothermic reactions have a negative enthalpy change (\u0394H < 0), while endothermic reactions have a positive enthalpy change (\u0394H > 0). Decomposition reactions often require energy input to break chemical bonds, making them endothermic. Combustion reactions always release energy, making them exothermic.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Which one of the following is an example of endothermic reaction? [amp_mcq option1=”CaO(s) + H\u2082O(l) \u2192 Ca(OH)\u2082(aq)” option2=”CaCO\u2083(s) \u2192 CaO(s) + CO\u2082(g)” option3=”C(s) + O\u2082(g) \u2192 CO\u2082(g)” option4=”CH\u2084(g) + 2O\u2082(g) \u2192 CO\u2082(g) + 2H\u2082O(l)” correct=”option2″] This question was previously asked in UPSC CAPF – 2021 Download PDFAttempt Online The correct answer is B) CaCO\u2083(s) \u2192 … <\/p>\n

Detailed SolutionWhich one of the following is an example of endothermic reaction?<\/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":[1085],"tags":[1110,1096,1155],"class_list":["post-90575","post","type-post","status-publish","format-standard","hentry","category-upsc-capf","tag-1110","tag-chemistry","tag-physical-and-chemical-changes-solution","no-featured-image-padding"],"yoast_head":"\nWhich one of the following is an example of endothermic reaction?<\/title>\n<meta name=\"description\" content=\"The correct answer is B) CaCO\u2083(s) \u2192 CaO(s) + CO\u2082(g). An endothermic reaction is a reaction that absorbs heat from its surroundings. A) CaO(s) + H\u2082O(l) \u2192 Ca(OH)\u2082(aq) (Slaking of lime) is a highly exothermic reaction, releasing significant heat. B) CaCO\u2083(s) \u2192 CaO(s) + CO\u2082(g) (Decomposition of calcium carbonate) requires heating to occur, meaning it absorbs heat from the surroundings, making it an endothermic reaction. C) C(s) + O\u2082(g) \u2192 CO\u2082(g) (Combustion of carbon) is an exothermic reaction, releasing heat and light. D) CH\u2084(g) + 2O\u2082(g) \u2192 CO\u2082(g) + 2H\u2082O(l) (Combustion of methane) is an exothermic reaction, releasing a large amount of heat.\" \/>\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-is-an-example-of-endothermic-reaction\/\" \/>\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 is an example of endothermic reaction?\" \/>\n<meta property=\"og:description\" content=\"The correct answer is B) CaCO\u2083(s) \u2192 CaO(s) + CO\u2082(g). An endothermic reaction is a reaction that absorbs heat from its surroundings. A) CaO(s) + H\u2082O(l) \u2192 Ca(OH)\u2082(aq) (Slaking of lime) is a highly exothermic reaction, releasing significant heat. B) CaCO\u2083(s) \u2192 CaO(s) + CO\u2082(g) (Decomposition of calcium carbonate) requires heating to occur, meaning it absorbs heat from the surroundings, making it an endothermic reaction. C) C(s) + O\u2082(g) \u2192 CO\u2082(g) (Combustion of carbon) is an exothermic reaction, releasing heat and light. D) CH\u2084(g) + 2O\u2082(g) \u2192 CO\u2082(g) + 2H\u2082O(l) (Combustion of methane) is an exothermic reaction, releasing a large amount of heat.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-an-example-of-endothermic-reaction\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T10:31:18+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":"Which one of the following is an example of endothermic reaction?","description":"The correct answer is B) CaCO\u2083(s) \u2192 CaO(s) + CO\u2082(g). 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