{"id":85382,"date":"2025-06-01T03:15:02","date_gmt":"2025-06-01T03:15:02","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=85382"},"modified":"2025-06-01T03:15:02","modified_gmt":"2025-06-01T03:15:02","slug":"which-one-of-the-following-is-the-correct-order-of-ph-for-the-given","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-the-correct-order-of-ph-for-the-given\/","title":{"rendered":"Which one of the following is the correct order of pH for the given"},"content":{"rendered":"

Which one of the following is the correct order of pH for the given substances?<\/p>\n

[amp_mcq option1=”Coffee < Lemon juice < Milk of magnesia < Blood\" option2=\"Milk of magnesia < Blood < Coffee < Lemon juice\" option3=\"Lemon juice < Blood < Milk of magnesia\" option4=\"Lemon juice < Coffee < Blood < Milk of magnesia\" correct=\"option4\"]\n\n\n\n

\n
\n
This question was previously asked in<\/div>\n
UPSC CDS-1 – 2023<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nThe pH scale measures the acidity or basicity of a solution. A pH of 7 is neutral. A pH less than 7 is acidic, and a pH greater than 7 is basic (alkaline). The lower the pH, the more acidic the substance. The higher the pH, the more basic the substance.
\nApproximate pH values for the given substances:
\n– Lemon juice: pH is typically around 2-2.5 (highly acidic).
\n– Coffee: pH is typically around 4.5-5 (acidic).
\n– Blood: pH is slightly alkaline, maintained within a narrow range of 7.35-7.45.
\n– Milk of magnesia (Magnesium hydroxide, Mg(OH)\u2082 suspension): A base, pH is typically around 10-11 (basic).
\nOrdering these substances from most acidic (lowest pH) to most basic (highest pH):
\nLemon juice (pH ~2) < Coffee (pH ~5) < Blood (pH ~7.4) < Milk of magnesia (pH ~10.5).\nChecking the options, option D follows this order.\n<\/section>\n
\n– Lower pH values indicate higher acidity.
\n– Higher pH values indicate higher basicity (alkalinity).
\n– Pure water has a neutral pH of 7.
\n<\/section>\n
\npH is defined as the negative logarithm of the hydrogen ion concentration ($pH = -\\log_{10}[H^+]$). The pH scale is logarithmic, meaning a difference of 1 pH unit represents a tenfold difference in acidity or basicity. Body fluids like blood have specific pH ranges that must be maintained for proper physiological function.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Which one of the following is the correct order of pH for the given substances? [amp_mcq option1=”Coffee < Lemon juice < Milk of magnesia < Blood\" option2=\"Milk of magnesia < Blood < Coffee < Lemon juice\" option3=\"Lemon juice < Blood < Milk of magnesia\" option4=\"Lemon juice < Coffee < Blood < Milk of magnesia\" correct=\"option4\"] ... \n\n

Detailed SolutionWhich one of the following is the correct order of pH for the given<\/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":[1087],"tags":[1105,1202,1096],"class_list":["post-85382","post","type-post","status-publish","format-standard","hentry","category-upsc-cds-1","tag-1105","tag-acid-base-and-salt","tag-chemistry","no-featured-image-padding"],"yoast_head":"\nWhich one of the following is the correct order of pH for the given<\/title>\n<meta name=\"description\" content=\"The pH scale measures the acidity or basicity of a solution. A pH of 7 is neutral. A pH less than 7 is acidic, and a pH greater than 7 is basic (alkaline). The lower the pH, the more acidic the substance. The higher the pH, the more basic the substance. Approximate pH values for the given substances: - Lemon juice: pH is typically around 2-2.5 (highly acidic). - Coffee: pH is typically around 4.5-5 (acidic). - Blood: pH is slightly alkaline, maintained within a narrow range of 7.35-7.45. - Milk of magnesia (Magnesium hydroxide, Mg(OH)\u2082 suspension): A base, pH is typically around 10-11 (basic). Ordering these substances from most acidic (lowest pH) to most basic (highest pH): Lemon juice (pH ~2) < Coffee (pH ~5) < Blood (pH ~7.4) < Milk of magnesia (pH ~10.5). Checking the options, option D follows this order. - Lower pH values indicate higher acidity. - Higher pH values indicate higher basicity (alkalinity). - Pure water has a neutral pH of 7.\" \/>\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-the-correct-order-of-ph-for-the-given\/\" \/>\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 the correct order of pH for the given\" \/>\n<meta property=\"og:description\" content=\"The pH scale measures the acidity or basicity of a solution. A pH of 7 is neutral. A pH less than 7 is acidic, and a pH greater than 7 is basic (alkaline). The lower the pH, the more acidic the substance. The higher the pH, the more basic the substance. Approximate pH values for the given substances: - Lemon juice: pH is typically around 2-2.5 (highly acidic). - Coffee: pH is typically around 4.5-5 (acidic). - Blood: pH is slightly alkaline, maintained within a narrow range of 7.35-7.45. - Milk of magnesia (Magnesium hydroxide, Mg(OH)\u2082 suspension): A base, pH is typically around 10-11 (basic). Ordering these substances from most acidic (lowest pH) to most basic (highest pH): Lemon juice (pH ~2) < Coffee (pH ~5) < Blood (pH ~7.4) < Milk of magnesia (pH ~10.5). Checking the options, option D follows this order. - Lower pH values indicate higher acidity. - Higher pH values indicate higher basicity (alkalinity). - Pure water has a neutral pH of 7.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-the-correct-order-of-ph-for-the-given\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T03:15:02+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":"Which one of the following is the correct order of pH for the given","description":"The pH scale measures the acidity or basicity of a solution. A pH of 7 is neutral. A pH less than 7 is acidic, and a pH greater than 7 is basic (alkaline). The lower the pH, the more acidic the substance. The higher the pH, the more basic the substance. Approximate pH values for the given substances: - Lemon juice: pH is typically around 2-2.5 (highly acidic). - Coffee: pH is typically around 4.5-5 (acidic). - Blood: pH is slightly alkaline, maintained within a narrow range of 7.35-7.45. - Milk of magnesia (Magnesium hydroxide, Mg(OH)\u2082 suspension): A base, pH is typically around 10-11 (basic). Ordering these substances from most acidic (lowest pH) to most basic (highest pH): Lemon juice (pH ~2) < Coffee (pH ~5) < Blood (pH ~7.4) < Milk of magnesia (pH ~10.5). Checking the options, option D follows this order. - Lower pH values indicate higher acidity. - Higher pH values indicate higher basicity (alkalinity). - Pure water has a neutral pH of 7.","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-is-the-correct-order-of-ph-for-the-given\/","og_locale":"en_US","og_type":"article","og_title":"Which one of the following is the correct order of pH for the given","og_description":"The pH scale measures the acidity or basicity of a solution. A pH of 7 is neutral. A pH less than 7 is acidic, and a pH greater than 7 is basic (alkaline). The lower the pH, the more acidic the substance. The higher the pH, the more basic the substance. Approximate pH values for the given substances: - Lemon juice: pH is typically around 2-2.5 (highly acidic). - Coffee: pH is typically around 4.5-5 (acidic). - Blood: pH is slightly alkaline, maintained within a narrow range of 7.35-7.45. - Milk of magnesia (Magnesium hydroxide, Mg(OH)\u2082 suspension): A base, pH is typically around 10-11 (basic). Ordering these substances from most acidic (lowest pH) to most basic (highest pH): Lemon juice (pH ~2) < Coffee (pH ~5) < Blood (pH ~7.4) < Milk of magnesia (pH ~10.5). Checking the options, option D follows this order. - Lower pH values indicate higher acidity. - Higher pH values indicate higher basicity (alkalinity). - Pure water has a neutral pH of 7.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-the-correct-order-of-ph-for-the-given\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T03:15:02+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\/which-one-of-the-following-is-the-correct-order-of-ph-for-the-given\/","url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-the-correct-order-of-ph-for-the-given\/","name":"Which one of the following is the correct order of pH for the given","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T03:15:02+00:00","dateModified":"2025-06-01T03:15:02+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"The pH scale measures the acidity or basicity of a solution. A pH of 7 is neutral. A pH less than 7 is acidic, and a pH greater than 7 is basic (alkaline). The lower the pH, the more acidic the substance. The higher the pH, the more basic the substance. Approximate pH values for the given substances: - Lemon juice: pH is typically around 2-2.5 (highly acidic). - Coffee: pH is typically around 4.5-5 (acidic). - Blood: pH is slightly alkaline, maintained within a narrow range of 7.35-7.45. - Milk of magnesia (Magnesium hydroxide, Mg(OH)\u2082 suspension): A base, pH is typically around 10-11 (basic). Ordering these substances from most acidic (lowest pH) to most basic (highest pH): Lemon juice (pH ~2) < Coffee (pH ~5) < Blood (pH ~7.4) < Milk of magnesia (pH ~10.5). Checking the options, option D follows this order. - Lower pH values indicate higher acidity. - Higher pH values indicate higher basicity (alkalinity). - Pure water has a neutral pH of 7.","breadcrumb":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-the-correct-order-of-ph-for-the-given\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-the-correct-order-of-ph-for-the-given\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-the-correct-order-of-ph-for-the-given\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/exam.pscnotes.com\/mcq\/"},{"@type":"ListItem","position":2,"name":"UPSC CDS-1","item":"https:\/\/exam.pscnotes.com\/mcq\/category\/upsc-cds-1\/"},{"@type":"ListItem","position":3,"name":"Which one of the following is the correct order of pH for the given"}]},{"@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\/85382","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=85382"}],"version-history":[{"count":0,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/85382\/revisions"}],"wp:attachment":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/media?parent=85382"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/categories?post=85382"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/tags?post=85382"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}