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Which of the following is true?

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pKb for  OH is 1.74 at 25C
The equilibrium constant for the reaction between HApKa=4 and NaOH at 25C.
The pH of a solution containing 0.1 M HCOOH
Ka=1.8×104 and 0.1 M HOCN
Ka=3.2×104 will be nearly (3log7)
All the above are correct.

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detailed solution

Correct option is D

(c) H+=k1c1+k2c2=50×103

pH=312log50 or 3log7

For this case, all the given statements are correct.

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