A certain buffer solution contains equal concentration of \( X^{-} \)and \( \mathrm{HX} \). The ...

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A certain buffer solution contains equal concentration of \( X^{-} \)and \( \mathrm{HX} \). The \( K_{b} \) for \( X^{-} \)is \( 10^{-10} \). The \( \mathrm{pH} \) of the buffer is :
[CPMT 1996; PMT (Raj.) 1997; DPMT 2004]
(a) 4
(b) 7
(c) 10
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