The precipitate of CaF_(2) (K_(sp) = 1.7 xx 10^(-10)) is obtained when equal volumes of the following are mixed ?

The precipitate of CaF_(2) (K_(sp) = 1.7 xx 10^(-10)) is obtained when

1.	The precipitate of CaF_(2) (K_(sp) = 1.7 xx 10^(-10)) is obtained when equal volumes of the following are mixed ?
Answer» `10^(-4) M Ca^(2+) + 10^(-4) M F^(-)` `10 ^(-2) M Ca^(2+) + 10 ^(-3) MF^(-)` `10^(-5) M Ca^(2+) + 10^(-3) M F^(-)` `10^(-3) M Ca^(2+) + 10^(-5) M F^(-)` ANSWER :B