The percent dissociation of a weak monobasic acid is $3 \%$ in its $0.02 \ M$ solution. What is the dissociation constant of the acid?

  • A
    $9 \times 10^{-4}$
  • B
    $3 \times 10^{-2}$
  • C
    $2 \times 10^{-2}$
  • D
    $1.8 \times 10^{-5}$

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