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JEE Main202628 January 2026Morning ShiftChemistryIonic EquilibriumActual

Consider a weak base ' B ' of pK _ b =5.699 . ' x ' mL of 0.02 M HCl and ' y ' mL of 0.02 M weak base ' B ' are mixed to make 100 mL of a buffer of pH 9 at 25^ C . The values of ' x ' and ' y ' respectively are: [Given: 2=0.3010, 3=0.4771, 5=0.699 ]

Options

  1. A( array |c|c| x & y 85.7 & 14.3 array )
  2. B( array |c|c| x & y 14.3 & 85.7 array )
  3. C( array |c|c| x & y 11.1 & 88.9 array )
  4. D( array |c|c| x & y 42.7 & 57.3 array )

Correct answer

B. ( array |c|c| x & y 14.3 & 85.7 array )

Step-by-step solution

pOH = pK_b + [ Salt Base ] 5 = 5.699 + [ Salt Base ] x y - x = 1 5 6x = y 7x = 100 x = 100 7 ml y = 600 7 ml

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