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NEET levelSingle correct optionDifficulty 1 of 3ie066

The pH of $0.1 M$ weak base $BOH$ with $K_{b} = 1 0^{- 5}$ at 298 K (use $[OH X^{-}] = K_{b} c$ ) is

A $11$
B $3$
C $9$
D $13$

Answer: A

[OH X^{-}] = 1 0^{- 5} \times 0.1 = 1 0^{- 3} M

, so

pOH = 3

and

pH = 14 - 3 = 11

.

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