{"id":89375,"date":"2025-06-01T10:03:21","date_gmt":"2025-06-01T10:03:21","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=89375"},"modified":"2025-06-01T10:03:21","modified_gmt":"2025-06-01T10:03:21","slug":"heavy-water-is-so-called-because-it","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/heavy-water-is-so-called-because-it\/","title":{"rendered":"Heavy water is so called because it"},"content":{"rendered":"

Heavy water is so called because it<\/p>\n

[amp_mcq option1=”contains a number of salts as in sea water” option2=”is the mercury contaminated water” option3=”is saline water used in hospitals” option4=”contains the heavier isotope of hydrogen in water” correct=”option4″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC CAPF – 2011<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nThe correct option is D. Heavy water, chemically represented as D\u2082O, contains deuterium, which is an isotope of hydrogen. Unlike the common hydrogen atom (protium, \u00b9H) which has only a proton, deuterium (\u00b2H or D) has a proton and a neutron, making it approximately twice as heavy as protium. Therefore, water molecules formed with deuterium (heavy water) are heavier than those formed with protium (ordinary water, H\u2082O).
\n<\/section>\n
\nThe question asks for the reason why heavy water is called “heavy”. It relates to its chemical composition and the presence of a heavier isotope of hydrogen.
\n<\/section>\n
\nHeavy water is primarily used as a neutron moderator in certain types of nuclear reactors (pressurized heavy water reactors – PHWRs) because deuterium has a lower neutron capture cross-section than protium, allowing for the use of unenriched uranium as fuel.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Heavy water is so called because it [amp_mcq option1=”contains a number of salts as in sea water” option2=”is the mercury contaminated water” option3=”is saline water used in hospitals” option4=”contains the heavier isotope of hydrogen in water” correct=”option4″] This question was previously asked in UPSC CAPF – 2011 Download PDFAttempt Online The correct option is D. … <\/p>\n

Detailed SolutionHeavy water is so called because it<\/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":[1465,1096,1161],"class_list":["post-89375","post","type-post","status-publish","format-standard","hentry","category-upsc-capf","tag-1465","tag-chemistry","tag-hydrogen-and-its-compounds","no-featured-image-padding"],"yoast_head":"\nHeavy water is so called because it<\/title>\n<meta name=\"description\" content=\"The correct option is D. Heavy water, chemically represented as D\u2082O, contains deuterium, which is an isotope of hydrogen. Unlike the common hydrogen atom (protium, \u00b9H) which has only a proton, deuterium (\u00b2H or D) has a proton and a neutron, making it approximately twice as heavy as protium. Therefore, water molecules formed with deuterium (heavy water) are heavier than those formed with protium (ordinary water, H\u2082O). The question asks for the reason why heavy water is called "heavy". It relates to its chemical composition and the presence of a heavier isotope of hydrogen.\" \/>\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\/heavy-water-is-so-called-because-it\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Heavy water is so called because it\" \/>\n<meta property=\"og:description\" content=\"The correct option is D. Heavy water, chemically represented as D\u2082O, contains deuterium, which is an isotope of hydrogen. Unlike the common hydrogen atom (protium, \u00b9H) which has only a proton, deuterium (\u00b2H or D) has a proton and a neutron, making it approximately twice as heavy as protium. Therefore, water molecules formed with deuterium (heavy water) are heavier than those formed with protium (ordinary water, H\u2082O). The question asks for the reason why heavy water is called "heavy". It relates to its chemical composition and the presence of a heavier isotope of hydrogen.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/heavy-water-is-so-called-because-it\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T10:03:21+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":"Heavy water is so called because it","description":"The correct option is D. Heavy water, chemically represented as D\u2082O, contains deuterium, which is an isotope of hydrogen. 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It relates to its chemical composition and the presence of a heavier isotope of hydrogen.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/heavy-water-is-so-called-because-it\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T10:03:21+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\/heavy-water-is-so-called-because-it\/","url":"https:\/\/exam.pscnotes.com\/mcq\/heavy-water-is-so-called-because-it\/","name":"Heavy water is so called because it","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T10:03:21+00:00","dateModified":"2025-06-01T10:03:21+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"The correct option is D. Heavy water, chemically represented as D\u2082O, contains deuterium, which is an isotope of hydrogen. Unlike the common hydrogen atom (protium, \u00b9H) which has only a proton, deuterium (\u00b2H or D) has a proton and a neutron, making it approximately twice as heavy as protium. Therefore, water molecules formed with deuterium (heavy water) are heavier than those formed with protium (ordinary water, H\u2082O). The question asks for the reason why heavy water is called \"heavy\". 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