AlF₃ is soluble in HF only in the presence of KF due to the formation of:

1.	K3[AlF3H3]	2.	K3[AlF6]
3.	AlH3	4.	K[AlF3H]

Which of the following correctly describes  behavior of Sn²⁺ and Pb⁴⁺?

Which of the following Group 13 elements cannot form the hexafluoro complex ion [MF₆]³⁻?

Select the correct order of atomic radii for the elements of Group 13.

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

Which of the following compounds exhibits a layered structure similar to that of graphite?

1. Boron (B)

2. Boron carbide (B₄C)

3. Diborane (B₂H₆)

4. Boron nitride (BN)

Which of the following is least likely to act as a Lewis base?

The stability of the +1 oxidation state increases in the sequence:

1. Al <Ga<In<Tl

2. Tl<In<Ga<Al

3. In<Tl<Ga<Al

4. Ga<In<Al<Tl

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 statements is incorrect?

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