$\mathrm{pH}$ value of which one of the following is not equal to one?

• Correct answer
  A

  $0.1 \mathrm{M} \mathrm{CH}_{3} \mathrm{COOH}$
• B

  $0.1 \mathrm{M} \mathrm{HNO}_{3}$
• C

  $0.05 \mathrm{M} \mathrm{H}_{2} \mathrm{SO}_{4}$
• D

  $50 \mathrm{~cm}^{3} 0.4 \mathrm{M} \mathrm{HCl}+50 \mathrm{~cm}^{3} 0.2 \mathrm{M} \mathrm{NaOH}$

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