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Dissolution of Solids and Gases in Liquid

In which of t...

Question

In which of the folowing cases is the acid strength highest ?

A

K_{a} = 10^{- 6}

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B

p K_{a} = 5

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C

p K_{b} = 10

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D

K_{b} = 10^{- 11}

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Solution

The correct option is D $K_{b} = 10^{- 11}$
Lesser the $p K_{a}$ higher the strength of acid as the dissociation constant is high.
For, $K_{b} = 10^{- 11}$ ; $K_{a} = 10^{- 3}$ because $K_{b} \cdot K_{a} = 10^{- 14}$ $k w$ .
So, for $K_{b} = 10^{- 11}$ , the acid strength is high.

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