A solution of weak acid $HA$ containing $0.01$ moles of acid per litre of solutions 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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