In aqueous solution the ionization constants for carbonic acid are

$K_1 = 4.2 \times 10^{-7}$ and $K_2 = 4.8 \times 10^{-11}$

Select the correct statement for a saturated $0.034\, M$ solution of the carbonic acid.

  • [AIEEE 2010]
  • A

    The concentration of $CO_3^{2-}$ is $0.034\, M.$

  • B

    The concentration of $CO_3^{2-}$ is greater than that of $HCO_3^-.$

  • C

    The concentrations of $H^+$ and $HCO_3^-$ are approximately equal.

  • D

    The concentration of $H^+$ is double that of $CO_3^{2-}.$

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