Question

$p{K}_a$ values of four acids are given below at ${25}^{o}C$. The strongest acid is:

• A. $2.0$
• B. $2.5$
• C. $3.0$
• D. $4.0$

Answer 1

The correct option is A $2.0$

Strong acid is an acid which dissociates almost completely in its aqueous solution means it value of dissociation constant is very high.If $K_a$ is high so its value of $p{K}_a$ is low so strongest acid is whose $p{K}_a$ is 2.