Identify the correct statements from the following:

a. ${\mathrm{CO}}_2\left(\mathrm{g}\right)$ is used as a refrigerant ice-cream and frozen food.

b. The structure of ${\mathrm{C}}_{60}$ customs12 six carbon rings and 25 five carbon rings

c. ZSM-5, a type of zeolite, is used to convent alcohol into gasoline.

d. CO is a colorless and odorless gas

1. (a) and (c) only

2. (b) and (c) only

3. (c) and (d) only

4. (a), (c) and (c) only

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