$A$ solution of weak acid $HA$ containing $0.01 \ mol/L$ of acid has $pH = 4$. The percentage degree of ionisation of the acid and the ionisation constant of acid are respectively.
- A$1\%, \ 10^{-6}$
- B$0.01\%, \ 10^{-4}$
- C$1\%, \ 10^{-4}$
- D$0.01\%, \ 10^{-6}$
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