$A$ buffer solution is prepared by mixing $0.2 \ M \ NH_4OH$ and $1 \ M \ NH_4Cl$. What is the $pH$ value of the buffer solution? (Given $pK_b = 4.744$)

  • A
    $9.256$
  • B
    $8.556$
  • C
    $5.444$
  • D
    $4.744$

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