One mixing `500 mL` of `10^-6 M Ca^(2+)` ion and `500 mL` of `10^-6 MF^-` ion, no precipitate of `CaF_2` will be obtained. `K_(sp) (CaF_2 = 10^-18)`.
If `K_(sp)` is greater than ionic product, a percipitate will develop.

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If assertion is false but reason is true.

Answer

C

Explanation

`[Ca^(2+)][F^-]^2 = [(500 xx 10^-6)/(100)] xx [(500 xx 10^-6)/(1000)]^2`
=`(1)/(8) xx 10^-18 = 0.12 xx 10^-18 lt K_(sp)`
Thus, precipitation will not take place.