A weak acid, $HA,$ has a $K_a$ of $1.00 \times 10^{-5}.$ If $0.100 \,mol$ of this acid is dissolved in one litreof water, the percentage of acid dissociated at equilibrium is closest to.....$\%$

  • [AIPMT 2007]
  • A

    $1$

  • B

    $99.9$

  • C

    $0.1$

  • D

    $99$

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