For the given reactions `SiO_(2) +4HF rarr SiF_(4) +2H_(2)O, DeltaH =- 10.17 kcal` `SiO_(2) +4HCI rarr SiCI_(4) +2H_(2)O, DeltaH = 36.7 kcal` It may be concluded thatA. `HF` will attack `SiO_(2)` and `HCI` will notB. `HCI` will attack `SiO_(2)` and `HF` will notC. `HF` and `HCI` both attack `SiO_(2)`D. None attacks `SiO_(2)`

For the given reactions `SiO_(2) +4HF rarr SiF_(4) +2H_(2)O, DeltaH =-

1.	For the given reactions `SiO_(2) +4HF rarr SiF_(4) +2H_(2)O, DeltaH =- 10.17 kcal` `SiO_(2) +4HCI rarr SiCI_(4) +2H_(2)O, DeltaH = 36.7 kcal` It may be concluded thatA. `HF` will attack `SiO_(2)` and `HCI` will notB. `HCI` will attack `SiO_(2)` and `HF` will notC. `HF` and `HCI` both attack `SiO_(2)`D. None attacks `SiO_(2)`
Answer» `DeltaG = DeltaH - T DeltaS =- ve` All exothermic reactions are spontaneous, hence `HF` will attack `SiO_(2)`.

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