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Assertion : On mixing 500 ml of 10^(-6) ...

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 true explanation of the assertion.

B

If both assertion and reason are true, but reason is not the true explanation of the assertion.

C

If aasertion is true, but reason is false.

D

If both assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
D
Correct A. `CaF_(2) hArr Ca^(2+) + 2 F^(-)`, Ionic product `=((10^(-6))/(2))((10^(_6))/(2))^(2) = 1.25 xx 10^(-19)` which is less than `K_(sp)` . Hence, no precipitate will develop.
Correct R. If ionic product is greater than `K_(sp)`, a precipitate will develop.
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