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Q.

The dissociation constant of monobasic acids A, B and C are 10^–4, 10^–6 and 10^–10 respectively. The concentration of each monobasic acid is 0.1 M. Which of the following has been arranged in increasing order of pH?

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a

B < C < A

b

B < A < C

c

C < B < A

d

A < B < C

answer is B.

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Detailed Solution

$HA ⇌ H^{+} + A^{-}$
$K_{a} = \frac{[H^{+}] [A^{-}]}{[HA]}$
Smaller the value of K_a, more will be pH.

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