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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 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 the assertion and reason both are false.

Text Solution

Verified by Experts

The correct Answer is:
D
`{:(Ca^(2+),+,2F^(-),hArr,CaF_(2)),(1/2 xx 10^(-6), ,1/2xx30xx10^(-6),,"0 at start"):}`
`((10^(-6))/2-(10^(-6))/2) (30/2xx10^(-6)-2xx(10^(-6))/2) ((10^(-6))/2)` at eqm .
`(10^(-6))/2` moles of `Ca^(2+)` ions will react with `10^(-6)` moles of `F^(-)` ions to form `(10^(-6))/2` moles of `CaF_(2)`
`K_(ip) = [Ca^(2+)][F^(-2)]^(2)`
`= (10^(-6))/2 xx (10^(-6))^(2) = 1/2 xx 10^(-18)`
` K_(sp) gt K_(ip)`, so precipitate will not form .
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