{"id":89516,"date":"2025-06-01T10:06:11","date_gmt":"2025-06-01T10:06:11","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=89516"},"modified":"2025-06-01T10:06:11","modified_gmt":"2025-06-01T10:06:11","slug":"which-one-among-the-following-salts-causes-hardness-to-the-water","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-one-among-the-following-salts-causes-hardness-to-the-water\/","title":{"rendered":"Which one among the following salts causes hardness to the water?"},"content":{"rendered":"

Which one among the following salts causes hardness to the water?<\/p>\n

[amp_mcq option1=”Calcium bicarbonate” option2=”Calcium carbonate” option3=”Sodium sulphate” option4=”Potassium chloride” correct=”option1″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC CAPF – 2012<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
Water hardness is caused by dissolved multivalent cations, primarily calcium (Ca\u00b2\u207a) and magnesium (Mg\u00b2\u207a) ions. These ions are usually present in water as salts like bicarbonates, sulfates, or chlorides.<\/section>\n
Calcium bicarbonate (Ca(HCO3)\u2082) is a common salt found dissolved in water that causes temporary hardness. When heated, calcium bicarbonate decomposes to form calcium carbonate, which precipitates out, reducing the hardness. Calcium carbonate (CaCO\u2083) itself is largely insoluble in water under normal conditions and does not dissolve significantly to cause hardness.<\/section>\n
Sodium salts (like sodium sulphate) and potassium salts (like potassium chloride) do not cause water hardness, as sodium (Na\u207a) and potassium (K\u207a) are monovalent ions. The term “hardness” specifically refers to the presence of divalent or trivalent metallic cations.<\/section>\n","protected":false},"excerpt":{"rendered":"

Which one among the following salts causes hardness to the water? [amp_mcq option1=”Calcium bicarbonate” option2=”Calcium carbonate” option3=”Sodium sulphate” option4=”Potassium chloride” correct=”option1″] This question was previously asked in UPSC CAPF – 2012 Download PDFAttempt Online Water hardness is caused by dissolved multivalent cations, primarily calcium (Ca\u00b2\u207a) and magnesium (Mg\u00b2\u207a) ions. These ions are usually present in … <\/p>\n

Detailed SolutionWhich one among the following salts causes hardness to the 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":[1085],"tags":[1116,1096,1155],"class_list":["post-89516","post","type-post","status-publish","format-standard","hentry","category-upsc-capf","tag-1116","tag-chemistry","tag-physical-and-chemical-changes-solution","no-featured-image-padding"],"yoast_head":"\nWhich one among the following salts causes hardness to the water?<\/title>\n<meta name=\"description\" content=\"Water hardness is caused by dissolved multivalent cations, primarily calcium (Ca\u00b2\u207a) and magnesium (Mg\u00b2\u207a) ions. These ions are usually present in water as salts like bicarbonates, sulfates, or chlorides. Calcium bicarbonate (Ca(HCO3)\u2082) is a common salt found dissolved in water that causes temporary hardness. When heated, calcium bicarbonate decomposes to form calcium carbonate, which precipitates out, reducing the hardness. Calcium carbonate (CaCO\u2083) itself is largely insoluble in water under normal conditions and does not dissolve significantly to cause 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-among-the-following-salts-causes-hardness-to-the-water\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Which one among the following salts causes hardness to the water?\" \/>\n<meta property=\"og:description\" content=\"Water hardness is caused by dissolved multivalent cations, primarily calcium (Ca\u00b2\u207a) and magnesium (Mg\u00b2\u207a) ions. These ions are usually present in water as salts like bicarbonates, sulfates, or chlorides. Calcium bicarbonate (Ca(HCO3)\u2082) is a common salt found dissolved in water that causes temporary hardness. When heated, calcium bicarbonate decomposes to form calcium carbonate, which precipitates out, reducing the hardness. 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These ions are usually present in water as salts like bicarbonates, sulfates, or chlorides. Calcium bicarbonate (Ca(HCO3)\u2082) is a common salt found dissolved in water that causes temporary hardness. When heated, calcium bicarbonate decomposes to form calcium carbonate, which precipitates out, reducing the hardness. 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Calcium carbonate (CaCO\u2083) itself is largely insoluble in water under normal conditions and does not dissolve significantly to cause hardness.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-among-the-following-salts-causes-hardness-to-the-water\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T10:06:11+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-among-the-following-salts-causes-hardness-to-the-water\/","url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-among-the-following-salts-causes-hardness-to-the-water\/","name":"Which one among the following salts causes hardness to the water?","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T10:06:11+00:00","dateModified":"2025-06-01T10:06:11+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"Water hardness is caused by dissolved multivalent cations, primarily calcium (Ca\u00b2\u207a) and magnesium (Mg\u00b2\u207a) ions. 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