Name the type of the structure of silicate in which one oxygen atom of [SiO₄]^4- is shared?

1.  Sheet silicate

2.  Pyrosilicate

3.  Three dimensional silicate

4.  Linear chain silicate

Al₂O₃ can be converted to anhydrous AlCl₃ by heating :

1. $A{l}_2{O}_3 with HCl gas$

2. $A{l}_2{O}_3$with NaCl in solid state

3. a mixture of $A{l}_2{O}_3$ and carbon in dry $C{l}_2$ gas

4. $A{l}_2{O}_3$ with $C{l}_2$ gas

Which of the following is an incorrect statement?

Aluminium chloride in acidified aqueous solution forms a complex 'A', in which hybridisation state of Al is 'B'. What are 'A' and 'B' 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 compounds is used in cosmetic surgery?

1. Silica

2. Silicates

3. Silicones

4. Zeolites

${\mathrm{Sn}}^{2+}$ compounds like SnO and ${\mathrm{SnCl}}_2$ are well known for reducing agents, while ${\mathrm{PbO}}_2$ acts as an oxidizing agent. Which of the following statements support these reactivities?

I.  SnO is more stable than ${\mathrm{SnO}}_2$

II.  ${\mathrm{Sn}}^{4+}$ is more stable than ${\mathrm{Sn}}^{2+}$

III.  ${\mathrm{Pb}}^{4+}$ is more stable than ${\mathrm{Pb}}^{2+}$

IV.  ${\mathrm{Pb}}^{2+}$ is more stable than ${\mathrm{Pb}}^{4+}$

1.  I and III

2.  I, III, and IV

3.  II and IV

4.  I, II, and IV

In chlorides, the common oxidation states of aluminum and thallium are +3 and +1 respectively because.

1.  Ti-Cl bond is ionic and Al-Cl bond is covalent

2.  6s electrons of TI are bound more strongly than the 3s electrons of AI

3.  Tl—Cl bond is stronger than Al-Cl bond

4.  3s electrons of Al are bond stronger than the 6s electrons of Tl

The correct order of atomic radii in group 13 elements is:

1. B < Al < In < Ga < Tl
2. B < Al < Ga < In < Tl
3. B < Ga < Al < Tl < In
4. B < Ga < Al < In < Tl