The $pK_a$ of a weak acid $(HA)$ and $pK_b$ of a weak base $(BOH)$ are $3.2$ and $3.4,$ respectively. The $pH$ of their salt $(AB)$ solution is

  • A
    $7.2$
  • B
    $6.9$
  • C
    $7.0$
  • D
    $1.0$

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