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Dissolution of Solids and Gases in Liquid

The pK a, va...

Question

The pK $_{a}$ , value of four acids are given below at 25 $^{o}$ C. The strongest acid is:

A

2

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B

2.5

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C

3

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D

4

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Solution

The correct option is A 2
$p k_{a} = l o g k_{a}$
$∴$ More the value of pk $_{a}$ weaker is the acid.
$∴$ Acid having lowest value of pk $_{a}$ , is strongest acid.
$∴$ Acid having pk $_{a}$ , value 2 is weakest acid.

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