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\( \mathrm{pH} \) of a saturated solution of \( \mathrm{Ba}(\mathrm{OH})_{2} \) is 12 . The value of solubility product \( \left(\mathrm{K}_{\mathrm{sp}}\right) \) of \( \mathrm{Ba}(\mathrm{OH})_{2} \) is :
(a) \( 3.3 \times 10^{-7} \)
(b) \( 5.0 \times 10^{-7} \)
(c) \( 4.0 \times 10^{-6} \)
(d) \( 5.0 \times 10^{-6} \)
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