{"id":88196,"date":"2025-06-01T07:04:24","date_gmt":"2025-06-01T07:04:24","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=88196"},"modified":"2025-06-01T07:04:24","modified_gmt":"2025-06-01T07:04:24","slug":"the-alkali-metals-have-relatively-low-melting-point-which-one-of-the","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/the-alkali-metals-have-relatively-low-melting-point-which-one-of-the\/","title":{"rendered":"The alkali metals have relatively low melting point. Which one of the"},"content":{"rendered":"

The alkali metals have relatively low melting point. Which one of the following alkali metals is expected to have the highest melting point?<\/p>\n

[amp_mcq option1=”Li” option2=”Na” option3=”K” option4=”Rb” correct=”option1″]<\/p>\n

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This question was previously asked in<\/div>\n
UPSC NDA-2 – 2015<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nThe alkali metals are in Group 1 of the periodic table: Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Caesium (Cs), and Francium (Fr). Moving down the group, the metallic bonding strength generally decreases due to the increasing atomic size and shielding effect, which weakens the attraction between the positive ions and the delocalized valence electrons. Weaker metallic bonding leads to lower melting points. Therefore, the melting points of alkali metals decrease down the group. Among the options provided (Li, Na, K, Rb), Lithium is at the top of the group and is expected to have the highest melting point.
\n<\/section>\n
\nMelting points of alkali metals decrease down the group (from Li to Fr) due to decreasing metallic bond strength.
\n<\/section>\n
\nThe approximate melting points are: Li (180.5 \u00b0C), Na (97.8 \u00b0C), K (63.5 \u00b0C), Rb (39.3 \u00b0C), Cs (28.5 \u00b0C). As expected, Lithium has the highest melting point among the given options. This trend is a typical example of how physical properties change across a group in the periodic table.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

The alkali metals have relatively low melting point. Which one of the following alkali metals is expected to have the highest melting point? [amp_mcq option1=”Li” option2=”Na” option3=”K” option4=”Rb” correct=”option1″] This question was previously asked in UPSC NDA-2 – 2015 Download PDFAttempt Online The alkali metals are in Group 1 of the periodic table: Lithium (Li), … <\/p>\n

Detailed SolutionThe alkali metals have relatively low melting point. Which one of the<\/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":[1443,1096,1109],"class_list":["post-88196","post","type-post","status-publish","format-standard","hentry","category-upsc-nda-2","tag-1443","tag-chemistry","tag-metals-minerals-ores-properties-uses","no-featured-image-padding"],"yoast_head":"\nThe alkali metals have relatively low melting point. Which one of the<\/title>\n<meta name=\"description\" content=\"The alkali metals are in Group 1 of the periodic table: Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Caesium (Cs), and Francium (Fr). Moving down the group, the metallic bonding strength generally decreases due to the increasing atomic size and shielding effect, which weakens the attraction between the positive ions and the delocalized valence electrons. Weaker metallic bonding leads to lower melting points. Therefore, the melting points of alkali metals decrease down the group. Among the options provided (Li, Na, K, Rb), Lithium is at the top of the group and is expected to have the highest melting point. Melting points of alkali metals decrease down the group (from Li to Fr) due to decreasing metallic bond strength.\" \/>\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\/the-alkali-metals-have-relatively-low-melting-point-which-one-of-the\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The alkali metals have relatively low melting point. Which one of the\" \/>\n<meta property=\"og:description\" content=\"The alkali metals are in Group 1 of the periodic table: Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Caesium (Cs), and Francium (Fr). Moving down the group, the metallic bonding strength generally decreases due to the increasing atomic size and shielding effect, which weakens the attraction between the positive ions and the delocalized valence electrons. Weaker metallic bonding leads to lower melting points. Therefore, the melting points of alkali metals decrease down the group. Among the options provided (Li, Na, K, Rb), Lithium is at the top of the group and is expected to have the highest melting point. Melting points of alkali metals decrease down the group (from Li to Fr) due to decreasing metallic bond strength.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/the-alkali-metals-have-relatively-low-melting-point-which-one-of-the\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T07:04:24+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":"The alkali metals have relatively low melting point. Which one of the","description":"The alkali metals are in Group 1 of the periodic table: Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Caesium (Cs), and Francium (Fr). Moving down the group, the metallic bonding strength generally decreases due to the increasing atomic size and shielding effect, which weakens the attraction between the positive ions and the delocalized valence electrons. Weaker metallic bonding leads to lower melting points. Therefore, the melting points of alkali metals decrease down the group. Among the options provided (Li, Na, K, Rb), Lithium is at the top of the group and is expected to have the highest melting point. Melting points of alkali metals decrease down the group (from Li to Fr) due to decreasing metallic bond strength.","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\/the-alkali-metals-have-relatively-low-melting-point-which-one-of-the\/","og_locale":"en_US","og_type":"article","og_title":"The alkali metals have relatively low melting point. Which one of the","og_description":"The alkali metals are in Group 1 of the periodic table: Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Caesium (Cs), and Francium (Fr). Moving down the group, the metallic bonding strength generally decreases due to the increasing atomic size and shielding effect, which weakens the attraction between the positive ions and the delocalized valence electrons. Weaker metallic bonding leads to lower melting points. Therefore, the melting points of alkali metals decrease down the group. Among the options provided (Li, Na, K, Rb), Lithium is at the top of the group and is expected to have the highest melting point. Melting points of alkali metals decrease down the group (from Li to Fr) due to decreasing metallic bond strength.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/the-alkali-metals-have-relatively-low-melting-point-which-one-of-the\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T07:04:24+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\/the-alkali-metals-have-relatively-low-melting-point-which-one-of-the\/","url":"https:\/\/exam.pscnotes.com\/mcq\/the-alkali-metals-have-relatively-low-melting-point-which-one-of-the\/","name":"The alkali metals have relatively low melting point. 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