NEET2025Chemistry-Acids and Bases
NEET 2025 Chemistry Ionization Constants Assertion Reason Question
Type: Assertion Reason-conceptual-Hard-Class 11
Phosphoric acid ionizes in three steps with their ionization constant values Kₐ₁, Kₐ₂ and Kₐ₃, respectively, while K is the overall ionization constant. Which of the following statements are true?
A. log K = log Kₐ₁ + log Kₐ₂ + log Kₐ₃
B. H₃PO₄ is a stronger acid than H₂PO₄⁻ and HPO₄²⁻.
C. Kₐ₁ > Kₐ₂ > Kₐ₃
D. Kₐ₁ = (Kₐ₃ + Kₐ₂) / 2
Choose the correct answer from the options given below:
A
A and B only
B
A and C only
C
B, C and D only
D
A, B and C only
Correct Answer
Option D
Detailed Explanation
Phosphoric acid ionizes in steps, with each subsequent ionization having a smaller Kₐ value. The overall ionization constant K is the product of the individual constants.
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