Question

Which of the following $p{K}_a$ value represents the strongest acid?

• A. $10^{-4}$
• B. $10^{-8}$
• C. $10^{-5}$
• D. $10^{-2}$

Answer 1

Answer: (B)

$p{K}_a=-\log K_a$
Smaller the value of $p{K}_a$, stronger will be acid
$\therefore$ Acid having $p{K}_a$ value of $10^{-8}$ is strongest acid.