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Question:

$\mathrm{pK}_{\mathrm{a}}$ of a weak acid (HA) and $\mathrm{pK}_{\mathrm{b}}$ of a weak base $(\mathrm{BOH})$ are $3.2$ and $3.4$, respectively. The $\mathrm{pH}$ of their salt $(A B)$ solution is

  1. $7.2$

  2. $6.9$

  3. $7.0$

  4. $1.0$


Correct Option: , 2

Solution:

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