The solubility of $CaCO_3$ is $7 \times 10^{-5} \ mol \ dm^{-3}$ at $25^{\circ} C$. What is its solubility product at same temperature?

  • A
    $6.7 \times 10^{-9}$
  • B
    $9.0 \times 10^{-9}$
  • C
    $1.12 \times 10^{-9}$
  • D
    $4.9 \times 10^{-9}$

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