A weak acid is titrated with a weak base. Consider the following statements regarding the $\mathrm{pH}$ of the solution at the equivalence point:
(i) $\mathrm{pH}$ depends on the concentration of acid and base.
(ii) $\mathrm{pH}$ is independent of the concentration of acid and base
(iii) $\mathrm{pH}$ depends on the ${\mathrm{pK}}_{\mathrm{a}}$ of acid and ${\mathrm{pK}}_{\mathrm{b}}$ of base.
(iv) $\mathrm{pH}$ is independent of the ${\mathrm{pK}}_{\mathrm{a}}$ of acid and ${\mathrm{pK}}_{\mathrm{b}}$ of base.
The correct statements are:-

• A

  only $\left(\mathrm{i}\right)$ and $\left(\mathrm{iii}\right)$
• B

  only $\left(\mathrm{i}\right)$ and $\left(\mathrm{iv}\right)$
• Correct answer
  C

  only $\left(\mathrm{ii}\right)$ and $\left(\mathrm{iii}\right)$
• D

  only $\left(\mathrm{ii}\right)$ and $\left(\mathrm{iv}\right)$

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