Which one of the following is the correct order of pH for the given

Which one of the following is the correct order of pH for the given substances? This question was previously asked inUPSC CDS-1 - 2023Download PDFAttempt Online 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)₂ 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. pH is defined as the negative logarithm of the hydrogen ion concentration ($pH -\log_{10}$). 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.

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