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2Litres of an aqueous solution is prepar...

2Litres of an aqueous solution is prepared containing initially `10^(-3)` moles of `MgCl_(2)` and `10^(-3)` moles of "NaF" .Find concentration of `F^(-)` ions in the solution at equlibrium. Given : Ksp`[MgF_(2)]`=`4times10^(-11)` (A) `2times10^(-4)M`
(B) `4times10^(-4)M`
(C) `5times10^(-4)M` (D) `8times10^(-4)M`

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