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A certain buffer solution contains equal...

A certain buffer solution contains equal concentartion of `X^(Theta)` and `HX`. The `K_(b)` for `X^(Theta)` is `10^(-10)`. The `pH` of the buffer is

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The correct Answer is:
4
`[4]`
`pKa` of `HX=14-10=4`
`pH=pK_(a)+log (1/1)=4`
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