Which of the following statements is wrong?
(1) The molecular formula of tetramethyl silane is (CH3)4 SiH4 .
(2) SiCl4 undergoes hydrolysis due to the presence of empty d-orbitals in Si.
(3) Fluorosilicic acid (H2 SiF6 ) is a strong acid, exist only in solution.
(4) The octahedral SiF-26 ion is the only halogen complex of silicon which involves sp3d2 hybridisation.
