The solubility product of $BaSO_4$ is $1.3 \times 10^{-9}$. The solubility of this salt in pure water will be

  • A
    $1.69 \times 10^{-9} \ mol \ L^{-1}$
  • B
    $1.69 \times 10^{-18} \ mol \ L^{-1}$
  • C
    $3.6 \times 10^{-18} \ mol \ L^{-1}$
  • D
    $3.6 \times 10^{-5} \ mol \ L^{-1}$

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