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Which of the following is true?

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{pK}_{b}

for

{OH}^{-}

- 1.74

25^{\circ} C

The equilibrium constant for the reaction between

HA ({pK}_{a} = 4)

and

NaOH

25^{\circ} C

The pH of a solution containing 0.1 M HCOOH

(K_{a} = 1.8 \times 10^{- 4})

and

0.1 M HOCN

(K_{a} = 3.2 \times 10^{- 4})

will be nearly

(3 - \log 7)

All the above are correct.

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detailed solution

Correct option is D

$pH = 3 - \frac{1}{2} \log 50 or 3 - \log 7$

For this case, all the given statements are correct.

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