1.

CaF_(2) used in HF "prep"^(n) must be free from SiO_(2) . Explain

Answer»

Solution :`CaF_(2)+H_(2)SO_(4)toCaSO_(4)+HF`
If `SiO_(2)` prsent as impurity
`{:(4HF+SiO_(2)SiF_(4)+2H_(2)O),(SiF_(4)+2HFtoH_(2)[SiF_(6)]):}}` Hence PRESENCE of one MOLECULE `SiO_(2)`
Consumer 6 molecule of HF


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