The dissociation constants $(K_a)$ of four acids are given below. Which of these is the strongest acid?

  • A
    $2 \times 10^{-2}$
  • B
    $0.02 \times 10^{-1}$
  • C
    $3 \times 10^{-4}$
  • D
    $2 \times 10^{-4}$

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