6 public questions tagged with this topic.
Electron-withdrawing groups (e.g., nitro) increase acidity; electron-donating groups (e.g., methoxy) decrease it. Order: 4-Methoxybenzoic acid < Benzoic acid < 4-Nitrobenzoic acid.
Ref: NCERT Class 12 Chemistry > Chapter 12: Aldehydes, Ketones and Carboxylic Acids > Topic: Chemical Reactions - Reduction, Oxidation and Tests - Tollens, Fehling, Iodoform
2,4,6-Trinitrophenol (picric acid) is the most acidic due to three electron-withdrawing -NO₂ groups stabilizing the phenoxide ion via resonance and inductive effects.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Physical Properties and Acidity of Alcohols and Phenols
pH = -log [H+] , 2.5 = -log [H+] , [H+] = 10⁻².⁵ ≈ 3.16 × 10⁻³ .
Ref: NCERT Class 11 Chemistry > Chapter 6: Equilibrium > Topic: Acid-Base Theories - Arrhenius Bronsted-Lowry Lewis and Salts Hydrolysis
They have a low Ka value is the scientifically accurate answer to this question. Within the study of Acid, Base, pH, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of They have a low Ka value directly address what is being asked. Among the other options, They completely ionize in solution, Their conjugate bases are weak, and They have a high pH do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 2
2 accurately defines or describes the concept asked in this question. Within Acid, Base, pH, precise definitions and terminology are essential for clear scientific communication. The other options (1, 3, and 4) either describe related but distinct concepts, use incorrect terminology, or confuse similar-sounding terms that have different scientific meanings. A thorough understanding of exact definitions helps distinguish between closely related biological concepts and is crucial for competitive examinations.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 2
HCl is the scientifically accurate answer to this question. Within the study of pH and Buffer, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of HCl directly address what is being asked. Among the other options, CH₃COOH, H₂CO₃, and NH₄⺠do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 2
