The first and second dissociation constants of an acid $H_2A$ are $1.0 \times 10^{-5}$ and $5.0 \times 10^{-10}$ respectively. The overall dissociation constant of the acid will be

  • [AIEEE 2007]
  • A

    $0.2 \times 10^5$

  • B

    $5.0 \times 10^{-5}$

  • C

    $5.0 \times 10^{15}$

  • D

    $5.0 \times 10^{-15}$

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