A) 4.0
B) 3.5
C) 2.5
D) 2
Correct Answer: D
Solution :
Strength of acid \[\propto \frac{1}{p{{K}_{a}}}\] \[\therefore \] acid with \[p{{K}_{a}}=2.0\] is strongest acid and one with \[p{{K}_{a}}=4.0\] is weakest acid. Note: \[p{{K}_{a}}=-\log {{K}_{a}}\] where \[{{K}_{a}}\] = ionisation constant of acid.
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