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JEE Main202225 Jul 2022Morning ShiftChemistryIonic EquilibriumActual

20 mL of 0 . 1 M NH 4 OH is mixed with 40 mL of 0 . 05 M HCl . The pH of the mixture is nearest to: (Given: K b NH 4 OH = 1 × 10 - 5 , log 2 = 0 . 30 , log 3 = 0 . 48 , log 5 = 0 . 69 , log 7 = 0 . 84 , log 11 = 1 . 04 )

Options

  1. A3 . 2
  2. B4 . 2
  3. C5 . 2
  4. D6 . 2

Correct answer

C. 5 . 2

Step-by-step solution

                        NH 4 OH + HCl → NH 4 Cl + H 2 O mmole     2                     2 after   reaction   -         -                       2   milimoles NH 4 + = 2   mmole 60   ml = 1 30 M pH = pK w - pK b - logC 2 = 14 - 5 + 1 . 48 2 = 5 . 24

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