Which of the following oxide is amphoteric in nature?

1. SnO₂

2. SiO₂

3. GeO₂

4. CO₂

Which of the following oxide is amphoteric?

1. CO₂ 

2. SnO₂

3. CaO 

4. SiO₂

Which of the following statements is incorrect?

1. NaHCO₃ on heating gives Na₂CO₃
2. Pure sodium metal dissolves in liquid ammonia to give a blue solution.
3. NaOH reacts with glass to give sodium silicate
4. Aluminium reacts with excess NaOH to give Al(OH)₃

Incorrect statement among the following about zeolites is:-

1. They have an open structure which enables them to take up small molecules.

2. Zeolites are aluminosilicates having a three-dimensional network.

3. Some of the ${\mathrm{SiO}}_4^{4-}$ units are replaced by ${\mathrm{AlO}}_4^{5-}\text{ and }{\mathrm{AlO}}_6^{9-}$ ions in zeolites.

4. They are used as cation exchangers.

In Borax bead test which compound is formed : 

1. Orthoborate

2. Metaborate

3. Double oxide

4. Tetraborate

$$\begin{gathered} Pb{O}_2 \to PbO ∆G_{298} <0 \\ Sn{O}_2\to SnO ∆G_{298} > 0 \end{gathered}$$

The most probable oxidation state of Pb & Sn will be-

1. ${\mathrm{Pb}}^{+4}, {\mathrm{Sn}}^{+4}$

2. ${\mathrm{Pb}}^{+4} , {\mathrm{Sn}}^{+2}$

3. ${\mathrm{Pb}}^{+2} , {\mathrm{Sn}}^{+2}$

4. ${\mathrm{Pb}}^{+2} , {\mathrm{Sn}}^{+4}$

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 compounds is used in cosmetic surgery?

1. Silica

2. Silicates

3. Silicones

4. Zeolites

Aluminium chloride in acidified aqueous solution forms a complex 'A'. The formula of A and hybridisation state of Al in 'A' is respectively-

1. [Al(H₂O)₆]³⁺, sp³d²

2. [Al(H₂O)₄]³⁺, sp³

3. [Al(H2O)4]3+, dsp2

4. [Al(H₂O)]³⁺, d²sp³

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