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

1.	NH3	2.	BF3
3.	OH-	4.	H2O

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

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

Which of the following species is not stable?

The basic structural unit of silicates is:

1. (SiO₄)^4–

2. (SiO₃)^2–

3. (SiO₄)^2–

4. (SiO)

Which of the following is not a monomer for a high molecular mass silicone polymer?

Which of the following represents the correct increasing order of stability of the +1 oxidation state among Al, Ga, In, and Tl?

1. Ga < ln < Al < Tl
2. Al < Ga < ln < Tl
3. Tl < ln < Ga < Al
4. ln < Tl < Ga < Al

Which of the following pairs contain species that are not isostructural?

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