\( \mathrm{pH} \) of a mixture containing \( 0.1 \mathrm{MX}^{-} \)and \( 0.2 \mathrm{M} \mathrm...

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\( \mathrm{pH} \) of a mixture containing \( 0.1 \mathrm{MX}^{-} \)and \( 0.2 \mathrm{M} \mathrm{HX} \) is : \( \left[\mathrm{pK}_{\mathrm{b}}\left(\mathrm{X}^{-}\right)=4\right] \)
(A) \( 4+\log 2 \)
(B) \( 4-\log 2 \)
(C) \( 10+\log 2 \)
(D) \( 10-\log 2 \)
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