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NEET2025ChemistryIonic EquilibriumActual

Phosphoric acid ionizes in three steps with their ionization constant values K _ a ₁ , ~K _ a ₂ and K _ a ₃ , respectively, While K is the overall ionization constant. Which of the following statements are true? A. K = K _ a ₁ + K _ a ₂ + K _ a ₃ B. H ₃ PO ₄ is a stronger acid than H ₂ PO ₄⁻ and HPO ₄²⁻ C. K_ a₁ K_ a₂ K_ a₃ D. K _ a ₁ = K _ a ₃ + K _ a ₂ 2 Choose the correct answer from the options given below:

Options

  1. AA and B only
  2. BA and C only
  3. CB , C and D only
  4. DA, B and C only

Correct answer

D. A, B and C only

Step-by-step solution

For polybasic acid, order of ionization constant is Ka ₁ Ka ₂ Ka ₃ because as negative charge increases, tendency to loose H ⁺ ions decreases. Overall K = Ka ₁ Ka ₂ Ka ₃ Taking log on both sides K = Ka ₁+ Ka ₂+ Ka ₃

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