A weak base $MOH$ of $0.1\, N$ concentration shows a $pH$ value of $9$. What is the  percentage degree of ionisation of the base ? ......$\%$

  • A

    $0.01$

  • B

    $0.001$

  • C

    $0.1$

  • D

    $0.02$

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  • [AIIMS 2007]

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