Q 2617423389.     `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 :

JEE 2017 Mains 2nd April
A

`7.0`

B

`1.0`

C

`7.2`

D

`6.9`

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