The $pH$ of a $0.1 \ M$ solution of the acid $HQ$ is $3$. The value of the ionization constant,$K_a$ of the acid is:

  • A
    $3 \times 10^{-1}$
  • B
    $1 \times 10^{-3}$
  • C
    $1 \times 10^{-5}$
  • D
    $1 \times 10^{-7}$

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