{"id":87446,"date":"2025-06-01T06:44:21","date_gmt":"2025-06-01T06:44:21","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=87446"},"modified":"2025-06-01T06:44:21","modified_gmt":"2025-06-01T06:44:21","slug":"which-one-of-the-following-elements-is-least-reactive-with-water","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-elements-is-least-reactive-with-water\/","title":{"rendered":"Which one of the following elements is least reactive with water ?"},"content":{"rendered":"

Which one of the following elements is least reactive with water ?<\/p>\n

[amp_mcq option1=”Lithium” option2=”Sodium” option3=”Potassium” option4=”Cesium” correct=”option1″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC NDA-1 – 2017<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nLithium, Sodium, Potassium, and Cesium are alkali metals belonging to Group 1 of the periodic table. The reactivity of alkali metals with water increases down the group due to the decreasing ionization energy and increasing atomic size, making it easier to lose the valence electron. Therefore, Lithium (Li) is the least reactive with water among the given options, while Cesium (Cs) is the most reactive.
\n<\/section>\n
\nReactivity of alkali metals with water increases from Lithium to Cesium.
\n<\/section>\n
\nLithium reacts slowly with water, producing hydrogen gas and lithium hydroxide. Sodium reacts vigorously, often melting due to the heat produced. Potassium, Rubidium, and Cesium react increasingly explosively with water.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Which one of the following elements is least reactive with water ? [amp_mcq option1=”Lithium” option2=”Sodium” option3=”Potassium” option4=”Cesium” correct=”option1″] This question was previously asked in UPSC NDA-1 – 2017 Download PDFAttempt Online Lithium, Sodium, Potassium, and Cesium are alkali metals belonging to Group 1 of the periodic table. The reactivity of alkali metals with water increases … <\/p>\n

Detailed SolutionWhich one of the following elements is least reactive with water ?<\/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":[1101,1096,1109],"class_list":["post-87446","post","type-post","status-publish","format-standard","hentry","category-upsc-nda-1","tag-1101","tag-chemistry","tag-metals-minerals-ores-properties-uses","no-featured-image-padding"],"yoast_head":"\nWhich one of the following elements is least reactive with water ?<\/title>\n<meta name=\"description\" content=\"Lithium, Sodium, Potassium, and Cesium are alkali metals belonging to Group 1 of the periodic table. The reactivity of alkali metals with water increases down the group due to the decreasing ionization energy and increasing atomic size, making it easier to lose the valence electron. Therefore, Lithium (Li) is the least reactive with water among the given options, while Cesium (Cs) is the most reactive. Reactivity of alkali metals with water increases from Lithium to Cesium.\" \/>\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-elements-is-least-reactive-with-water\/\" \/>\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 elements is least reactive with water ?\" \/>\n<meta property=\"og:description\" content=\"Lithium, Sodium, Potassium, and Cesium are alkali metals belonging to Group 1 of the periodic table. The reactivity of alkali metals with water increases down the group due to the decreasing ionization energy and increasing atomic size, making it easier to lose the valence electron. Therefore, Lithium (Li) is the least reactive with water among the given options, while Cesium (Cs) is the most reactive. Reactivity of alkali metals with water increases from Lithium to Cesium.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-elements-is-least-reactive-with-water\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T06:44:21+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":"Which one of the following elements is least reactive with water ?","description":"Lithium, Sodium, Potassium, and Cesium are alkali metals belonging to Group 1 of the periodic table. 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