What happens when (i) Concentrated `H_2 SO_4` is added to calcium fluoride. (ii) `SO_3` is passed through water ?

(i) It forms hydrogen fluoride
`CaF_(2) + H_(2)SO_(4) to CaSO_(4) + 2HF`
(ii) It dissolves `SO_(3)` to gives `H_(2)SO_(4)`.
`SO_(3) + H_(2)O to H_(2) SO_(4)`

What happens when (i) Concentrated `H_2 SO_4` is added to calcium fluoride. (ii) `SO_3` is passed through water ?

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