The ionisation cosntabnt of an acid, `K_(a)` is the meaure of strength of an acid. The `K_(a)` values of acetic acid, hypochlorous acid and formic acid are `1.74xx10^(-5)`, `3.0xx10^(-8)` and `1.8xx10^(-4)` respectively. Which of the following orders of ph of `0.1` mol `dm^(-3)` solutions of these acids is correct ?

Options

A. acetic acid `gt` hypochlorous acid `gt` formic acid
B. hypochlorous acid `gt` acetic acid `gt` formic acid
C. formic acid `gt` hypochlorus acid `gt` acetic acid
D. formic acid `gt` acetic acid `gt` hpochlorus acid

Answer

D

Explanation

Larger the value of `Ka` large will be `[H_(3)O^(+)]` and lower will be pH