Which among the following halides is inert towards hydrolysis?

1. BF₃

2. SiCl₄

3. PCl₅

4. SF₆

The correct statements among I to III regarding group 13 element oxides are:
(I) Boron trioxide or diboron trioxide is acidic.
(II) Oxides of aluminium and gallium are amphoteric.
(III) Oxides of indium and thallium are basic.
1. (I) and (II) only
2. (I) and (III) only
3. (II) and (III) only
4. (I), (II), and (III) only

Aluminium chloride exists as dinner, Al₂Cl₆ in the solid state as well as in the solution of non-polar solvents such as benzene. When dissolved in acidified aqueous solution, it gives:

1. \(\mathrm{Al}^{3+}+3 \mathrm{Cl}^{-}\)

2. \(\left[\mathrm{Al}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}+3 \mathrm{Cl}^{-} \)

3. \(\left[\mathrm{Al}(\mathrm{OH})_{6}\right]^{3-}+3 \mathrm{HCl}\)

4. \(\mathrm{Al}_{2} \mathrm{O}_{3}+6 \mathrm{HCl}\)