{"id":90377,"date":"2025-06-01T10:27:21","date_gmt":"2025-06-01T10:27:21","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=90377"},"modified":"2025-06-01T10:27:21","modified_gmt":"2025-06-01T10:27:21","slug":"which-one-of-the-following-is-used-for-water-softening","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-used-for-water-softening\/","title":{"rendered":"Which one of the following is used for water softening ?"},"content":{"rendered":"

Which one of the following is used for water softening ?<\/p>\n

[amp_mcq option1=”Mg(HCO3<\/sub>)2<\/sub>” option2=”Na3<\/sub>PO4<\/sub>” option3=”Na6<\/sub>P6<\/sub>O18<\/sub>” option4=”Na2<\/sub>HPO4<\/sub>” correct=”option3″]<\/p>\n

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\n
This question was previously asked in<\/div>\n
UPSC CAPF – 2019<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
The correct answer is C, Na\u2086P\u2086O\u2081\u2088.<\/section>\n
Na\u2086P\u2086O\u2081\u2088 is Sodium Hexametaphosphate, also known commercially as Calgon. It is a complex phosphate widely used as a water softening agent because it forms soluble complexes with calcium and magnesium ions, preventing them from precipitating and causing hardness.<\/section>\n
Hard water contains high concentrations of dissolved minerals, particularly calcium (Ca\u00b2\u207a) and magnesium (Mg\u00b2\u207a) ions. Water softening aims to remove or neutralize these ions. Sodium salts like sodium hexametaphosphate sequester these ions, effectively “softening” the water. Sodium phosphate (Na\u2083PO\u2084) can also be used to precipitate hard ions, but hexametaphosphate is particularly effective due to its chelating ability.<\/section>\n","protected":false},"excerpt":{"rendered":"

Which one of the following is used for water softening ? [amp_mcq option1=”Mg(HCO3)2” option2=”Na3PO4” option3=”Na6P6O18” option4=”Na2HPO4” correct=”option3″] This question was previously asked in UPSC CAPF – 2019 Download PDFAttempt Online The correct answer is C, Na\u2086P\u2086O\u2081\u2088. Na\u2086P\u2086O\u2081\u2088 is Sodium Hexametaphosphate, also known commercially as Calgon. It is a complex phosphate widely used as a water … <\/p>\n

Detailed SolutionWhich one of the following is used for water softening ?<\/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":[1119,1096,1239],"class_list":["post-90377","post","type-post","status-publish","format-standard","hentry","category-upsc-capf","tag-1119","tag-chemistry","tag-inorganic-chemistry","no-featured-image-padding"],"yoast_head":"\nWhich one of the following is used for water softening ?<\/title>\n<meta name=\"description\" content=\"The correct answer is C, Na\u2086P\u2086O\u2081\u2088. Na\u2086P\u2086O\u2081\u2088 is Sodium Hexametaphosphate, also known commercially as Calgon. It is a complex phosphate widely used as a water softening agent because it forms soluble complexes with calcium and magnesium ions, preventing them from precipitating and causing hardness.\" \/>\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-used-for-water-softening\/\" \/>\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 used for water softening ?\" \/>\n<meta property=\"og:description\" content=\"The correct answer is C, Na\u2086P\u2086O\u2081\u2088. Na\u2086P\u2086O\u2081\u2088 is Sodium Hexametaphosphate, also known commercially as Calgon. It is a complex phosphate widely used as a water softening agent because it forms soluble complexes with calcium and magnesium ions, preventing them from precipitating and causing hardness.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-used-for-water-softening\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T10:27:21+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 is used for water softening ?","description":"The correct answer is C, Na\u2086P\u2086O\u2081\u2088. 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It is a complex phosphate widely used as a water softening agent because it forms soluble complexes with calcium and magnesium ions, preventing them from precipitating and causing hardness.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-used-for-water-softening\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T10:27:21+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\/which-one-of-the-following-is-used-for-water-softening\/","url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-used-for-water-softening\/","name":"Which one of the following is used for water softening ?","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T10:27:21+00:00","dateModified":"2025-06-01T10:27:21+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"The correct answer is C, Na\u2086P\u2086O\u2081\u2088. Na\u2086P\u2086O\u2081\u2088 is Sodium Hexametaphosphate, also known commercially as Calgon. 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