{"id":88174,"date":"2025-06-01T07:03:57","date_gmt":"2025-06-01T07:03:57","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=88174"},"modified":"2025-06-01T07:03:57","modified_gmt":"2025-06-01T07:03:57","slug":"which-of-the-following-statements-regarding-heavy-water-are-correct","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-statements-regarding-heavy-water-are-correct\/","title":{"rendered":"Which of the following statements regarding heavy water are correct?"},"content":{"rendered":"<p>Which of the following statements regarding heavy water are correct?<\/p>\n<ul>\n<li>1. It is extensively used as a moderator in nuclear reactors<\/li>\n<li>2. It cannot be used in exchange reaction to study reaction mechanism<\/li>\n<li>3. Viscosity of heavy water is relatively smaller than that of ordinary water<\/li>\n<li>4. The dielectric constant of heavy water is smaller than that of ordinary water<\/li>\n<\/ul>\n<p>Select the correct answer using the code given below:<\/p>\n<p>[amp_mcq option1=&#8221;1 and 2&#8243; option2=&#8221;2 and 3&#8243; option3=&#8221;3 and 4&#8243; option4=&#8221;1 and 4&#8243; correct=&#8221;option4&#8243;]<\/p>\n<div class=\"psc-box-pyq-exam-year-detail\">\n<div class=\"pyq-exam\">\n<div class=\"psc-heading\">This question was previously asked in<\/div>\n<div class=\"psc-title line-ellipsis\">UPSC NDA-2 &#8211; 2015<\/div>\n<\/div>\n<div class=\"pyq-exam-psc-buttons\"><a href=\"\/pyq\/pyq-upsc-nda-2-2015.pdf\" target=\"_blank\" class=\"psc-pdf-button\" rel=\"noopener\">Download PDF<\/a><a href=\"\/pyq-upsc-nda-2-2015\" target=\"_blank\" class=\"psc-attempt-button\" rel=\"noopener\">Attempt Online<\/a><\/div>\n<\/div>\n<section id=\"pyq-correct-answer\">Statement 1 is correct: Heavy water (D\u2082O) is an excellent moderator in nuclear reactors because deuterium has a low neutron absorption cross-section and can effectively slow down fast neutrons to thermal energies. Statement 2 is incorrect: Heavy water and deuterated compounds are commonly used in isotopic exchange reactions to study reaction mechanisms and kinetics. Statement 3 is incorrect: The viscosity of heavy water is slightly higher than that of ordinary water at typical temperatures. Statement 4 is correct: The dielectric constant of heavy water is slightly smaller than that of ordinary water.<\/section>\n<section id=\"pyq-key-points\">This question tests specific properties of heavy water compared to ordinary water.<\/section>\n<section id=\"pyq-additional-information\">Heavy water is chemically similar to ordinary water but has different physical properties due to the heavier deuterium isotope replacing hydrogen. It is essential for some types of nuclear reactors (like CANDU reactors) that use unenriched uranium fuel.<\/section>\n","protected":false},"excerpt":{"rendered":"<p>Which of the following statements regarding heavy water are correct? 1. It is extensively used as a moderator in nuclear reactors 2. It cannot be used in exchange reaction to study reaction mechanism 3. Viscosity of heavy water is relatively smaller than that of ordinary water 4. The dielectric constant of heavy water is smaller &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Which of the following statements regarding heavy water are correct?\" class=\"read-more button\" href=\"https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-statements-regarding-heavy-water-are-correct\/#more-88174\">Detailed Solution<span class=\"screen-reader-text\">Which of the following statements regarding heavy water are correct?<\/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":[1094],"tags":[1443,1096,1161],"class_list":["post-88174","post","type-post","status-publish","format-standard","hentry","category-upsc-nda-2","tag-1443","tag-chemistry","tag-hydrogen-and-its-compounds","no-featured-image-padding"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.2 (Yoast SEO v23.3) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Which of the following statements regarding heavy water are correct?<\/title>\n<meta name=\"description\" content=\"Statement 1 is correct: Heavy water (D\u2082O) is an excellent moderator in nuclear reactors because deuterium has a low neutron absorption cross-section and can effectively slow down fast neutrons to thermal energies. Statement 2 is incorrect: Heavy water and deuterated compounds are commonly used in isotopic exchange reactions to study reaction mechanisms and kinetics. Statement 3 is incorrect: The viscosity of heavy water is slightly higher than that of ordinary water at typical temperatures. Statement 4 is correct: The dielectric constant of heavy water is slightly smaller than that of ordinary water. This question tests specific properties of heavy water compared to ordinary water.\" \/>\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-of-the-following-statements-regarding-heavy-water-are-correct\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Which of the following statements regarding heavy water are correct?\" \/>\n<meta property=\"og:description\" content=\"Statement 1 is correct: Heavy water (D\u2082O) is an excellent moderator in nuclear reactors because deuterium has a low neutron absorption cross-section and can effectively slow down fast neutrons to thermal energies. Statement 2 is incorrect: Heavy water and deuterated compounds are commonly used in isotopic exchange reactions to study reaction mechanisms and kinetics. Statement 3 is incorrect: The viscosity of heavy water is slightly higher than that of ordinary water at typical temperatures. Statement 4 is correct: The dielectric constant of heavy water is slightly smaller than that of ordinary water. This question tests specific properties of heavy water compared to ordinary water.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-statements-regarding-heavy-water-are-correct\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T07:03:57+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 of the following statements regarding heavy water are correct?","description":"Statement 1 is correct: Heavy water (D\u2082O) is an excellent moderator in nuclear reactors because deuterium has a low neutron absorption cross-section and can effectively slow down fast neutrons to thermal energies. Statement 2 is incorrect: Heavy water and deuterated compounds are commonly used in isotopic exchange reactions to study reaction mechanisms and kinetics. Statement 3 is incorrect: The viscosity of heavy water is slightly higher than that of ordinary water at typical temperatures. Statement 4 is correct: The dielectric constant of heavy water is slightly smaller than that of ordinary water. This question tests specific properties of heavy water compared to ordinary water.","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\/which-of-the-following-statements-regarding-heavy-water-are-correct\/","og_locale":"en_US","og_type":"article","og_title":"Which of the following statements regarding heavy water are correct?","og_description":"Statement 1 is correct: Heavy water (D\u2082O) is an excellent moderator in nuclear reactors because deuterium has a low neutron absorption cross-section and can effectively slow down fast neutrons to thermal energies. Statement 2 is incorrect: Heavy water and deuterated compounds are commonly used in isotopic exchange reactions to study reaction mechanisms and kinetics. Statement 3 is incorrect: The viscosity of heavy water is slightly higher than that of ordinary water at typical temperatures. Statement 4 is correct: The dielectric constant of heavy water is slightly smaller than that of ordinary water. This question tests specific properties of heavy water compared to ordinary water.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-statements-regarding-heavy-water-are-correct\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T07:03:57+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\/which-of-the-following-statements-regarding-heavy-water-are-correct\/","url":"https:\/\/exam.pscnotes.com\/mcq\/which-of-the-following-statements-regarding-heavy-water-are-correct\/","name":"Which of the following statements regarding heavy water are correct?","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T07:03:57+00:00","dateModified":"2025-06-01T07:03:57+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"Statement 1 is correct: Heavy water (D\u2082O) is an excellent moderator in nuclear reactors because deuterium has a low neutron absorption cross-section and can effectively slow down fast neutrons to thermal energies. Statement 2 is incorrect: Heavy water and deuterated compounds are commonly used in isotopic exchange reactions to study reaction mechanisms and kinetics. Statement 3 is incorrect: The viscosity of heavy water is slightly higher than that of ordinary water at typical temperatures. Statement 4 is correct: The dielectric constant of heavy water is slightly smaller than that of ordinary water. 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