{"id":88481,"date":"2025-06-01T07:12:02","date_gmt":"2025-06-01T07:12:02","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=88481"},"modified":"2025-06-01T07:12:02","modified_gmt":"2025-06-01T07:12:02","slug":"the-solution-of-which-one-of-the-following-will-have-ph-less-than-7","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/the-solution-of-which-one-of-the-following-will-have-ph-less-than-7\/","title":{"rendered":"The solution of which one of the following will have pH less than 7?"},"content":{"rendered":"

The solution of which one of the following will have pH less than 7?<\/p>\n

[amp_mcq option1=”NaOH” option2=”KCl” option3=”FeCl\u2083” option4=”NaCl” correct=”option3″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC NDA-2 – 2018<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nThe pH of a solution indicates its acidity or alkalinity. A pH less than 7 is acidic, pH equal to 7 is neutral, and pH greater than 7 is alkaline (basic). Let’s analyze the given options:
\nA) NaOH (Sodium hydroxide) is a strong base. Its solution is alkaline (pH > 7).
\nB) KCl (Potassium chloride) is a salt formed from a strong acid (HCl) and a strong base (KOH). Its solution is neutral (pH \u2248 7).
\nC) FeCl\u2083 (Iron(III) chloride) is a salt formed from a weak base (Fe(OH)\u2083) and a strong acid (HCl). When dissolved in water, metal ions with high charge density, like Fe\u00b3\u207a, undergo hydrolysis, reacting with water to produce hydrated metal ions and release H\u207a ions, making the solution acidic: FeCl\u2083(aq) + 3H\u2082O(l) \u21cc Fe(OH)\u2083(s) + 3H\u207a(aq) + 3Cl\u207b(aq). Therefore, its solution will have a pH less than 7.
\nD) NaCl (Sodium chloride) is a salt formed from a strong acid (HCl) and a strong base (NaOH). Its solution is neutral (pH \u2248 7).
\n<\/section>\n
\nThe pH of a salt solution depends on the strength of the acid and base from which the salt is formed. Salts of strong acid and strong base are neutral, salts of strong acid and weak base are acidic, and salts of weak acid and strong base are alkaline.
\n<\/section>\n
\nHydrolysis is the reaction of a substance with water. In the case of salts formed from weak acids or bases, the ions can react with water, affecting the pH of the solution. Cations from weak bases and anions from weak acids are the ones that undergo significant hydrolysis.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

The solution of which one of the following will have pH less than 7? [amp_mcq option1=”NaOH” option2=”KCl” option3=”FeCl\u2083” option4=”NaCl” correct=”option3″] This question was previously asked in UPSC NDA-2 – 2018 Download PDFAttempt Online The pH of a solution indicates its acidity or alkalinity. A pH less than 7 is acidic, pH equal to 7 is … <\/p>\n

Detailed SolutionThe solution of which one of the following will have pH less than 7?<\/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":[1114,1202,1096],"class_list":["post-88481","post","type-post","status-publish","format-standard","hentry","category-upsc-nda-2","tag-1114","tag-acid-base-and-salt","tag-chemistry","no-featured-image-padding"],"yoast_head":"\nThe solution of which one of the following will have pH less than 7?<\/title>\n<meta name=\"description\" content=\"The pH of a solution indicates its acidity or alkalinity. A pH less than 7 is acidic, pH equal to 7 is neutral, and pH greater than 7 is alkaline (basic). Let's analyze the given options: A) NaOH (Sodium hydroxide) is a strong base. Its solution is alkaline (pH > 7). B) KCl (Potassium chloride) is a salt formed from a strong acid (HCl) and a strong base (KOH). Its solution is neutral (pH \u2248 7). C) FeCl\u2083 (Iron(III) chloride) is a salt formed from a weak base (Fe(OH)\u2083) and a strong acid (HCl). When dissolved in water, metal ions with high charge density, like Fe\u00b3\u207a, undergo hydrolysis, reacting with water to produce hydrated metal ions and release H\u207a ions, making the solution acidic: FeCl\u2083(aq) + 3H\u2082O(l) \u21cc Fe(OH)\u2083(s) + 3H\u207a(aq) + 3Cl\u207b(aq). Therefore, its solution will have a pH less than 7. D) NaCl (Sodium chloride) is a salt formed from a strong acid (HCl) and a strong base (NaOH). Its solution is neutral (pH \u2248 7). The pH of a salt solution depends on the strength of the acid and base from which the salt is formed. Salts of strong acid and strong base are neutral, salts of strong acid and weak base are acidic, and salts of weak acid and strong base are alkaline.\" \/>\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-solution-of-which-one-of-the-following-will-have-ph-less-than-7\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The solution of which one of the following will have pH less than 7?\" \/>\n<meta property=\"og:description\" content=\"The pH of a solution indicates its acidity or alkalinity. A pH less than 7 is acidic, pH equal to 7 is neutral, and pH greater than 7 is alkaline (basic). Let's analyze the given options: A) NaOH (Sodium hydroxide) is a strong base. Its solution is alkaline (pH > 7). B) KCl (Potassium chloride) is a salt formed from a strong acid (HCl) and a strong base (KOH). Its solution is neutral (pH \u2248 7). C) FeCl\u2083 (Iron(III) chloride) is a salt formed from a weak base (Fe(OH)\u2083) and a strong acid (HCl). When dissolved in water, metal ions with high charge density, like Fe\u00b3\u207a, undergo hydrolysis, reacting with water to produce hydrated metal ions and release H\u207a ions, making the solution acidic: FeCl\u2083(aq) + 3H\u2082O(l) \u21cc Fe(OH)\u2083(s) + 3H\u207a(aq) + 3Cl\u207b(aq). Therefore, its solution will have a pH less than 7. D) NaCl (Sodium chloride) is a salt formed from a strong acid (HCl) and a strong base (NaOH). Its solution is neutral (pH \u2248 7). The pH of a salt solution depends on the strength of the acid and base from which the salt is formed. Salts of strong acid and strong base are neutral, salts of strong acid and weak base are acidic, and salts of weak acid and strong base are alkaline.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/the-solution-of-which-one-of-the-following-will-have-ph-less-than-7\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T07:12:02+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 solution of which one of the following will have pH less than 7?","description":"The pH of a solution indicates its acidity or alkalinity. A pH less than 7 is acidic, pH equal to 7 is neutral, and pH greater than 7 is alkaline (basic). Let's analyze the given options: A) NaOH (Sodium hydroxide) is a strong base. Its solution is alkaline (pH > 7). B) KCl (Potassium chloride) is a salt formed from a strong acid (HCl) and a strong base (KOH). Its solution is neutral (pH \u2248 7). C) FeCl\u2083 (Iron(III) chloride) is a salt formed from a weak base (Fe(OH)\u2083) and a strong acid (HCl). When dissolved in water, metal ions with high charge density, like Fe\u00b3\u207a, undergo hydrolysis, reacting with water to produce hydrated metal ions and release H\u207a ions, making the solution acidic: FeCl\u2083(aq) + 3H\u2082O(l) \u21cc Fe(OH)\u2083(s) + 3H\u207a(aq) + 3Cl\u207b(aq). Therefore, its solution will have a pH less than 7. D) NaCl (Sodium chloride) is a salt formed from a strong acid (HCl) and a strong base (NaOH). Its solution is neutral (pH \u2248 7). The pH of a salt solution depends on the strength of the acid and base from which the salt is formed. Salts of strong acid and strong base are neutral, salts of strong acid and weak base are acidic, and salts of weak acid and strong base are alkaline.","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-solution-of-which-one-of-the-following-will-have-ph-less-than-7\/","og_locale":"en_US","og_type":"article","og_title":"The solution of which one of the following will have pH less than 7?","og_description":"The pH of a solution indicates its acidity or alkalinity. A pH less than 7 is acidic, pH equal to 7 is neutral, and pH greater than 7 is alkaline (basic). Let's analyze the given options: A) NaOH (Sodium hydroxide) is a strong base. Its solution is alkaline (pH > 7). B) KCl (Potassium chloride) is a salt formed from a strong acid (HCl) and a strong base (KOH). Its solution is neutral (pH \u2248 7). C) FeCl\u2083 (Iron(III) chloride) is a salt formed from a weak base (Fe(OH)\u2083) and a strong acid (HCl). When dissolved in water, metal ions with high charge density, like Fe\u00b3\u207a, undergo hydrolysis, reacting with water to produce hydrated metal ions and release H\u207a ions, making the solution acidic: FeCl\u2083(aq) + 3H\u2082O(l) \u21cc Fe(OH)\u2083(s) + 3H\u207a(aq) + 3Cl\u207b(aq). Therefore, its solution will have a pH less than 7. D) NaCl (Sodium chloride) is a salt formed from a strong acid (HCl) and a strong base (NaOH). Its solution is neutral (pH \u2248 7). The pH of a salt solution depends on the strength of the acid and base from which the salt is formed. Salts of strong acid and strong base are neutral, salts of strong acid and weak base are acidic, and salts of weak acid and strong base are alkaline.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/the-solution-of-which-one-of-the-following-will-have-ph-less-than-7\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T07:12:02+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-solution-of-which-one-of-the-following-will-have-ph-less-than-7\/","url":"https:\/\/exam.pscnotes.com\/mcq\/the-solution-of-which-one-of-the-following-will-have-ph-less-than-7\/","name":"The solution of which one of the following will have pH less than 7?","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T07:12:02+00:00","dateModified":"2025-06-01T07:12:02+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"The pH of a solution indicates its acidity or alkalinity. A pH less than 7 is acidic, pH equal to 7 is neutral, and pH greater than 7 is alkaline (basic). Let's analyze the given options: A) NaOH (Sodium hydroxide) is a strong base. Its solution is alkaline (pH > 7). B) KCl (Potassium chloride) is a salt formed from a strong acid (HCl) and a strong base (KOH). Its solution is neutral (pH \u2248 7). C) FeCl\u2083 (Iron(III) chloride) is a salt formed from a weak base (Fe(OH)\u2083) and a strong acid (HCl). When dissolved in water, metal ions with high charge density, like Fe\u00b3\u207a, undergo hydrolysis, reacting with water to produce hydrated metal ions and release H\u207a ions, making the solution acidic: FeCl\u2083(aq) + 3H\u2082O(l) \u21cc Fe(OH)\u2083(s) + 3H\u207a(aq) + 3Cl\u207b(aq). Therefore, its solution will have a pH less than 7. D) NaCl (Sodium chloride) is a salt formed from a strong acid (HCl) and a strong base (NaOH). Its solution is neutral (pH \u2248 7). The pH of a salt solution depends on the strength of the acid and base from which the salt is formed. Salts of strong acid and strong base are neutral, salts of strong acid and weak base are acidic, and salts of weak acid and strong base are alkaline.","breadcrumb":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/the-solution-of-which-one-of-the-following-will-have-ph-less-than-7\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/exam.pscnotes.com\/mcq\/the-solution-of-which-one-of-the-following-will-have-ph-less-than-7\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/exam.pscnotes.com\/mcq\/the-solution-of-which-one-of-the-following-will-have-ph-less-than-7\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/exam.pscnotes.com\/mcq\/"},{"@type":"ListItem","position":2,"name":"UPSC NDA-2","item":"https:\/\/exam.pscnotes.com\/mcq\/category\/upsc-nda-2\/"},{"@type":"ListItem","position":3,"name":"The solution of which one of the following will have pH less than 7?"}]},{"@type":"WebSite","@id":"https:\/\/exam.pscnotes.com\/mcq\/#website","url":"https:\/\/exam.pscnotes.com\/mcq\/","name":"MCQ and Quiz for Exams","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/exam.pscnotes.com\/mcq\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209","name":"rawan239","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/761a7274f9cce048fa5b921221e7934820d74514df93ef195a9d22af0c1c9001?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/761a7274f9cce048fa5b921221e7934820d74514df93ef195a9d22af0c1c9001?s=96&d=mm&r=g","caption":"rawan239"},"sameAs":["https:\/\/exam.pscnotes.com"],"url":"https:\/\/exam.pscnotes.com\/mcq\/author\/rawan239\/"}]}},"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/88481","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/comments?post=88481"}],"version-history":[{"count":0,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/88481\/revisions"}],"wp:attachment":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/media?parent=88481"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/categories?post=88481"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/tags?post=88481"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}