When solid NaF is treated with conc. H_(2)SO_(4) in a test tube, followed by warming, then dimeric form of a gas is evolved, by which the test tube acquires a greasy appearance on its walls. Subsequently, the gas liberated when brought in contact with moistened glass rod forms a deposit which contains:

When solid NaF is treated with conc. H_(2)SO_(4) in a test tube, follo

1.	When solid NaF is treated with conc. H_(2)SO_(4) in a test tube, followed by warming, then dimeric form of a gas is evolved, by which the test tube acquires a greasy appearance on its walls. Subsequently, the gas liberated when brought in contact with moistened glass rod forms a deposit which contains:
Answer» `SiF_(4)` `H_(2)SiF_(6)` `SiO_(2).H_(2)O` `H_(2)SiO_(3)` ANSWER :B::C::D