Which of the following is the correct formula for the ionic product $(K_{sp})$ of $SnS_2$ (stannic sulfide)?

  • A
    $[Sn^{2+}] [S^{2-}]^2$
  • B
    $[Sn^{2+}]^2 [S^{2-}]$
  • C
    $[Sn^{4+}] [S^{2-}]^2$
  • D
    $[Sn^{4+}]^2 [S^{2-}]$

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