The pH of a $0.1$ molar solution of the acid $\mathrm{HQ}$ is 3 . The value of the ionization constant, Ka
of this acid is :-
$1 \times 10^{-7}$
$3 \times 10^{-7}$
$1 \times 10^{-3}$
$1 \times 10^{-5}$
Correct Option: , 4
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