{"id":87546,"date":"2025-06-01T06:47:21","date_gmt":"2025-06-01T06:47:21","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=87546"},"modified":"2025-06-01T06:47:21","modified_gmt":"2025-06-01T06:47:21","slug":"which-one-of-the-following-gives-the-highest-amount-of-hydrogen-ions","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-gives-the-highest-amount-of-hydrogen-ions\/","title":{"rendered":"Which one of the following gives the highest amount of hydrogen ions ("},"content":{"rendered":"<p>Which one of the following gives the highest amount of hydrogen ions (H\u207a) ?<\/p>\n<p>[amp_mcq option1=&#8221;Sodium hydroxide solution&#8221; option2=&#8221;Milk of magnesia&#8221; option3=&#8221;Lemon juice&#8221; option4=&#8221;Gastric juice&#8221; correct=&#8221;option4&#8243;]<\/p>\n<div class=\"psc-box-pyq-exam-year-detail\">\n<div class=\"pyq-exam\">\n<div class=\"psc-heading\">This question was previously asked in<\/div>\n<div class=\"psc-title line-ellipsis\">UPSC NDA-1 &#8211; 2018<\/div>\n<\/div>\n<div class=\"pyq-exam-psc-buttons\"><a href=\"\/pyq\/pyq-upsc-nda-1-2018.pdf\" target=\"_blank\" class=\"psc-pdf-button\" rel=\"noopener\">Download PDF<\/a><a href=\"\/pyq-upsc-nda-1-2018\" target=\"_blank\" class=\"psc-attempt-button\" rel=\"noopener\">Attempt Online<\/a><\/div>\n<\/div>\n<section id=\"pyq-correct-answer\">\nThe correct answer is D) Gastric juice.<br \/>\n<\/section>\n<section id=\"pyq-key-points\">\nThe amount of hydrogen ions (H\u207a) in a solution determines its acidity, measured by pH. A lower pH indicates a higher concentration of H\u207a ions and thus higher acidity.<br \/>\nA) Sodium hydroxide solution (NaOH) is a strong base, having a very high pH and thus a very low concentration of H\u207a ions.<br \/>\nB) Milk of magnesia (Mg(OH)\u2082) is a weak base, having a high pH but lower than NaOH, still a very low concentration of H\u207a ions compared to acids.<br \/>\nC) Lemon juice contains citric acid and has a pH typically between 2.0 and 2.5, indicating a significant concentration of H\u207a ions.<br \/>\nD) Gastric juice in the stomach contains hydrochloric acid (HCl) and has a very low pH, typically ranging from 1.5 to 3.5. This extremely low pH indicates a very high concentration of H\u207a ions, necessary for digesting proteins and killing ingested microorganisms. Comparing the typical pH values, gastric juice is the most acidic among the options, meaning it has the highest concentration of hydrogen ions.<br \/>\n<\/section>\n<section id=\"pyq-additional-information\">\npH is defined as the negative logarithm (base 10) of the hydrogen ion concentration: pH = -log\u2081\u2080[H\u207a]. Therefore, a decrease of 1 unit in pH corresponds to a tenfold increase in H\u207a concentration. Gastric juice&#8217;s low pH (e.g., 2) means a much higher H\u207a concentration than lemon juice (e.g., 2.5).<br \/>\n<\/section>\n","protected":false},"excerpt":{"rendered":"<p>Which one of the following gives the highest amount of hydrogen ions (H\u207a) ? [amp_mcq option1=&#8221;Sodium hydroxide solution&#8221; option2=&#8221;Milk of magnesia&#8221; option3=&#8221;Lemon juice&#8221; option4=&#8221;Gastric juice&#8221; correct=&#8221;option4&#8243;] This question was previously asked in UPSC NDA-1 &#8211; 2018 Download PDFAttempt Online The correct answer is D) Gastric juice. The amount of hydrogen ions (H\u207a) in a solution &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Which one of the following gives the highest amount of hydrogen ions (\" class=\"read-more button\" href=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-gives-the-highest-amount-of-hydrogen-ions\/#more-87546\">Detailed Solution<span class=\"screen-reader-text\">Which one of the following gives the highest amount of hydrogen ions (<\/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":[1114,1202,1096],"class_list":["post-87546","post","type-post","status-publish","format-standard","hentry","category-upsc-nda-1","tag-1114","tag-acid-base-and-salt","tag-chemistry","no-featured-image-padding"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.2 (Yoast SEO v23.3) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Which one of the following gives the highest amount of hydrogen ions (<\/title>\n<meta name=\"description\" content=\"The correct answer is D) Gastric juice. The amount of hydrogen ions (H\u207a) in a solution determines its acidity, measured by pH. A lower pH indicates a higher concentration of H\u207a ions and thus higher acidity. A) Sodium hydroxide solution (NaOH) is a strong base, having a very high pH and thus a very low concentration of H\u207a ions. B) Milk of magnesia (Mg(OH)\u2082) is a weak base, having a high pH but lower than NaOH, still a very low concentration of H\u207a ions compared to acids. C) Lemon juice contains citric acid and has a pH typically between 2.0 and 2.5, indicating a significant concentration of H\u207a ions. D) Gastric juice in the stomach contains hydrochloric acid (HCl) and has a very low pH, typically ranging from 1.5 to 3.5. This extremely low pH indicates a very high concentration of H\u207a ions, necessary for digesting proteins and killing ingested microorganisms. Comparing the typical pH values, gastric juice is the most acidic among the options, meaning it has the highest concentration of hydrogen ions.\" \/>\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-gives-the-highest-amount-of-hydrogen-ions\/\" \/>\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 gives the highest amount of hydrogen ions (\" \/>\n<meta property=\"og:description\" content=\"The correct answer is D) Gastric juice. The amount of hydrogen ions (H\u207a) in a solution determines its acidity, measured by pH. A lower pH indicates a higher concentration of H\u207a ions and thus higher acidity. A) Sodium hydroxide solution (NaOH) is a strong base, having a very high pH and thus a very low concentration of H\u207a ions. B) Milk of magnesia (Mg(OH)\u2082) is a weak base, having a high pH but lower than NaOH, still a very low concentration of H\u207a ions compared to acids. C) Lemon juice contains citric acid and has a pH typically between 2.0 and 2.5, indicating a significant concentration of H\u207a ions. D) Gastric juice in the stomach contains hydrochloric acid (HCl) and has a very low pH, typically ranging from 1.5 to 3.5. This extremely low pH indicates a very high concentration of H\u207a ions, necessary for digesting proteins and killing ingested microorganisms. Comparing the typical pH values, gastric juice is the most acidic among the options, meaning it has the highest concentration of hydrogen ions.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-gives-the-highest-amount-of-hydrogen-ions\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T06:47:21+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 gives the highest amount of hydrogen ions (","description":"The correct answer is D) Gastric juice. The amount of hydrogen ions (H\u207a) in a solution determines its acidity, measured by pH. A lower pH indicates a higher concentration of H\u207a ions and thus higher acidity. A) Sodium hydroxide solution (NaOH) is a strong base, having a very high pH and thus a very low concentration of H\u207a ions. B) Milk of magnesia (Mg(OH)\u2082) is a weak base, having a high pH but lower than NaOH, still a very low concentration of H\u207a ions compared to acids. C) Lemon juice contains citric acid and has a pH typically between 2.0 and 2.5, indicating a significant concentration of H\u207a ions. D) Gastric juice in the stomach contains hydrochloric acid (HCl) and has a very low pH, typically ranging from 1.5 to 3.5. This extremely low pH indicates a very high concentration of H\u207a ions, necessary for digesting proteins and killing ingested microorganisms. Comparing the typical pH values, gastric juice is the most acidic among the options, meaning it has the highest concentration of hydrogen ions.","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\/which-one-of-the-following-gives-the-highest-amount-of-hydrogen-ions\/","og_locale":"en_US","og_type":"article","og_title":"Which one of the following gives the highest amount of hydrogen ions (","og_description":"The correct answer is D) Gastric juice. The amount of hydrogen ions (H\u207a) in a solution determines its acidity, measured by pH. A lower pH indicates a higher concentration of H\u207a ions and thus higher acidity. A) Sodium hydroxide solution (NaOH) is a strong base, having a very high pH and thus a very low concentration of H\u207a ions. B) Milk of magnesia (Mg(OH)\u2082) is a weak base, having a high pH but lower than NaOH, still a very low concentration of H\u207a ions compared to acids. C) Lemon juice contains citric acid and has a pH typically between 2.0 and 2.5, indicating a significant concentration of H\u207a ions. D) Gastric juice in the stomach contains hydrochloric acid (HCl) and has a very low pH, typically ranging from 1.5 to 3.5. This extremely low pH indicates a very high concentration of H\u207a ions, necessary for digesting proteins and killing ingested microorganisms. Comparing the typical pH values, gastric juice is the most acidic among the options, meaning it has the highest concentration of hydrogen ions.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-gives-the-highest-amount-of-hydrogen-ions\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T06:47:21+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-gives-the-highest-amount-of-hydrogen-ions\/","url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-gives-the-highest-amount-of-hydrogen-ions\/","name":"Which one of the following gives the highest amount of hydrogen ions (","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T06:47:21+00:00","dateModified":"2025-06-01T06:47:21+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"The correct answer is D) Gastric juice. The amount of hydrogen ions (H\u207a) in a solution determines its acidity, measured by pH. A lower pH indicates a higher concentration of H\u207a ions and thus higher acidity. A) Sodium hydroxide solution (NaOH) is a strong base, having a very high pH and thus a very low concentration of H\u207a ions. B) Milk of magnesia (Mg(OH)\u2082) is a weak base, having a high pH but lower than NaOH, still a very low concentration of H\u207a ions compared to acids. C) Lemon juice contains citric acid and has a pH typically between 2.0 and 2.5, indicating a significant concentration of H\u207a ions. D) Gastric juice in the stomach contains hydrochloric acid (HCl) and has a very low pH, typically ranging from 1.5 to 3.5. This extremely low pH indicates a very high concentration of H\u207a ions, necessary for digesting proteins and killing ingested microorganisms. Comparing the typical pH values, gastric juice is the most acidic among the options, meaning it has the highest concentration of hydrogen ions.","breadcrumb":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-gives-the-highest-amount-of-hydrogen-ions\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-gives-the-highest-amount-of-hydrogen-ions\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-gives-the-highest-amount-of-hydrogen-ions\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/exam.pscnotes.com\/mcq\/"},{"@type":"ListItem","position":2,"name":"UPSC NDA-1","item":"https:\/\/exam.pscnotes.com\/mcq\/category\/upsc-nda-1\/"},{"@type":"ListItem","position":3,"name":"Which one of the following gives the highest amount of hydrogen ions ("}]},{"@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\/87546","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=87546"}],"version-history":[{"count":0,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/87546\/revisions"}],"wp:attachment":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/media?parent=87546"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/categories?post=87546"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/tags?post=87546"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}