Q. Which of the following $pK_{a}$ values, represent the strongest acid?
A) $10^{- 4}$
B) $10^{- 8}$
C) $10^{- 5}$
D) $10^{- 2}$
Explanation
(b)
$pK_{a} = - \log K_{a}$
Where, $K_{a} =$ ionisation constant of weak acid. Smaller the value of $pK_{a}$, stronger will be the acid. So, $pK_{a} = 10^{- 8}$ is strongest acid.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.