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If first dissociation of X(OH)(3) is 100...

If first dissociation of `X(OH)_(3)` is `100%` where as second dissociation is `50%` and third dissociation is negligible then the pH `4xx10^(-3) M X(OH)_(3)` is :

A

`11.78`

B

`10.78`

C

`2.5`

D

`2.22`

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