Identify the correct statements from the following:

Which of the following oxide is amphoteric in nature?

1. SnO₂

2. SiO₂

3. GeO₂

4. CO₂

The incorrect statement among the following is:

1.  SnF₄ is ionic in nature.

2.  PbF₄ is covalent in nature.

3.  SiCl₄ is easily hydrolysed.

4.  GeX₄ (X = F, Cl, Br, I) is more stable than GeX₂

Which of the following species is not stable?

1. ${\left[{\mathrm{SiCl}}_6\right]}^{2-}$

2. ${\left[{\mathrm{SiF}}_6\right]}^{2-}$

3. ${\left[{\mathrm{GeCl}}_6\right]}^{2-}$

4. ${\left[\mathrm{Sn}{\left(\mathrm{OH}\right)}_6\right]}^{2-}$