Which of the following expression for \% dissociation of a monoacid...

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Which of the following expression for \% dissociation of a monoacidic base \( (\mathrm{BOH}) \) in aqueous solution at appreciable concentration is not correct?
(a) \( 100 \times \sqrt{\frac{K_{b}}{c}} \)
(b) \( \frac{1}{1+10^{\left(\mathrm{p} K_{\mathrm{b}}-\mathrm{pOH}\right)}} \)
(c) \( \frac{K_{w}\left[\mathrm{H}^{+}\right]}{K_{b}+K_{w}} \)
(d) \( \frac{K_{b}}{K_{b}+\left[\mathrm{OH}^{-}\right]} \)
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