1.

The precipitate of `CaF_(2) (K_(sp)=1.7xx10^(-10))` is obtained when equal volumes of the following are mixedA. `10^(-4) M Ca^(2+) ion` and `10^(-4) M F^(-)`B. `10^(-2) M Ca^(2+)` and `10^(-3) M F^(-)`C. `10^(-5) M Ca^(2+)` and `10^(-3) M F^(-)`D. `10^(-3) M Ca^(2+)` and `10^(-5) M F^(-)`

Answer» Correct Answer - B
`[Ca^(2+)]=(10^(-2))/(2)M`
`[F^(-)]=(10^(-3))/(2)M`
`I.P.=[Ca^(2+)][F^(-)]^(2)=((10^(-2))/(2))((10^(-3))/(2))^(2)=(10^(-8))/(8)`
`I.P.gtK_(sp)`


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