Class $\mathrm{XII}$ students were asked to prepare one litre of buffer solution of $\mathrm{pH} 8.26$ by their chemistry teacher. The amount of ammonium chloride to be dissolved by the student in $0.2\mathrm{M}$ ammonia solution to make one litre of the buffer is (Given ${\mathrm{pK}}_{\mathrm{b}}\left({\mathrm{NH}}_3\right)=4.74;$ Molar mass of ${\mathrm{NH}}_3=17 \mathrm{g}{ \mathrm{mol}}^{-1}$. Molar mass of ${\mathrm{NH}}_4\mathrm{Cl}=53.5 \mathrm{g}{ \mathrm{mol}}^{-1}$)

• A

  $53.5 \mathrm{g}$
• B

  $72.3 \mathrm{g}$
• Correct answer
  C

  $107 \mathrm{g}$
• D

  $126\mathrm{g}$

Hence, the correct answer is option: 'C'.