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If $K_{sp}$ of $CaF_2$ at $25\,^oC$ is $1.7 \times 10^{-10}$, the combination amongst the following which gives a precipitate of $CaF_2$ is

• A
  $1 \times 10^{-2}\, M\,\,  Ca^{2+}$  and  $1 \times 10^{-5}\, M\,\,  F^-$
• B
  $1 \times 10^{-4}\, M\,\, Ca^{2+}$  and  $1 \times 10^{-4}\, M\,\, F^-$
• C
  $1 \times 10^{-3}\, M\,\, Ca^{2+}$  and  $1 \times 10^{-5}\, M\,\, F^-$
• ✓
  $1 \times 10^{-2}\, M\,\, Ca^{2+}$  and  $1 \times 10^{-3}\, M\,\, F^-$