If first dissociation of \( X(\mathrm{OH})_{3} \) is \( 100 \% \) where as second dissociation i...

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If first dissociation of \( X(\mathrm{OH})_{3} \) is \( 100 \% \) where as second dissociation is \( 50 \% \) and third dissociation is negligible then the \( \mathrm{pH} \) of \( 4 \times 10^{-3} \mathrm{MX}(\mathrm{OH})_{3} \) is :
(a) \( 11.78 \)
(b) \( 10.78 \)
(c) \( 2.5 \)
(d) \( 2.22 \)
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