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

${\mathrm{Sn}}^{2+}$ 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

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', 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 is an incorrect statement?

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

1.  Sheet silicate

2.  Pyrosilicate

3.  Three dimensional silicate

4.  Linear chain silicate

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