Assertion : On mixing 500 ml of `10^(-6) M Ca^(2+)` ion and 500 ml of `30 xx 10^(-6) M F^(-)` ion, the precipitate of `CaF_(2)` will be obtained. `K_(sp) (CaF_(2) = 10^(-18))` Reason : If `K_(sp)` is greater than ionic product, a precipitate will develop.A. If both assertion and reason are true and reason is the correct explanation of the assertionB. 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 the assertion and reason both are false.

Assertion : On mixing 500 ml of `10^(-6) M Ca^(2+)` ion and 500 ml of

1.	Assertion : On mixing 500 ml of `10^(-6) M Ca^(2+)` ion and 500 ml of `30 xx 10^(-6) M F^(-)` ion, the precipitate of `CaF_(2)` will be obtained. `K_(sp) (CaF_(2) = 10^(-18))` Reason : If `K_(sp)` is greater than ionic product, a precipitate will develop.A. If both assertion and reason are true and reason is the correct explanation of the assertionB. 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 the assertion and reason both are false.
Answer» Correct Answer - D `CaF_(2) hArr Ca^(2+) + 2F^(-)` `K = ((10^(-6))/(2))((10^(-6))/(2))^(2) = 1.25 xx 10^(-19)` which is less than `K_(sp)`. Hence, no precipitate will develop. Thus, both assertion and reason are false.

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