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Q.

If for $p K a$ fluoride at $25^{0} C$ is 11, the ionisation constant if hydrofluoric acid in water at this temperature is

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a

$10^{- 5}$

b

$10^{- 3}$

c

$10^{- 4}$

d

$10^{- 2}$

answer is A.

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Detailed Solution

$K_{w} = K_{a} x K_{b}; K_{a} = \frac{K_{w}}{K_{b}}$

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If for pKa fluoride at 250C is 11, the ionisation constant if hydrofluoric acid in water at this temperature is