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JEE Main202622 January 2026Evening ShiftChemistryIonic EquilibriumActual

Which of the following mixture gives a buffer solution with pH =9.25 ? Given : pK _ b ( NH ₄ OH )=4.75

Options

  1. A0.2 M NH ₄ OH (0.5 ~L )+0.1 M HCl (0.5 ~L )
  2. B0.2 M NH ₄ OH (0.4 ~L )+0.1 M HCl (1 ~L )
  3. C0.4 M NH ₄ OH (1 ~L )+0.1 M HCl (1 ~L )
  4. D0.5 M NH ₄ OH (0.2 ~L )+0.2 M HCl (0.5 ~L )

Correct answer

A. 0.2 M NH ₄ OH (0.5 ~L )+0.1 M HCl (0.5 ~L )

Step-by-step solution

pOH = pK_b + Salt Base 4.75 = 4.75 + Salt Base Milimoles of [Salt] = milimoles of [Base] NH₄OH + HCl NH₄Cl + H₂O 0.2M, 0.5L 0.1M, 0.5L 100 mmole 50 mmole 50 mmole - 50 mmole Milimoles of NH₄OH = milimoles of NH₄Cl

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