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Higher pKb means weaker base. Aniline (C₆H₅NH₂) has the highest pKb (weakest base) due to resonance, as per the PDF’s basicity section.
Ref: NCERT Class 12 Chemistry > Chapter 13: Amines > Topic: Reaction with Nitrous Acid and Diazonium Salts - Part 2
pKb = -log Kb = -log(3.2 × 10⁻⁶) = 6 - log 3.2 ≈ 6 - 0.505 = 5.495 ≈ 5.5 .
Ref: NCERT Class 11 Chemistry > Chapter 6: Equilibrium > Topic: Homogeneous and Heterogeneous Equilibria and Applications of Equilibrium Constant
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