Find the correct decreasing order of bond order among the following species:

1. O₂²⁺ > O₂⁺ > O₂⁻
2. O₂²⁺ < O₂⁻ < O₂⁺
3. O₂⁺ > O₂⁻ < O₂²⁺
4. O₂⁻ < O₂⁺ > O₂²⁺

The total number of $\mathrm{\pi }$-bond electrons in the following structure is :

1. 4       

2. 8         

3. 12         

4. 16

In which of the following pairs, both the species are not isostructural?

1. ${\mathrm{SiCl}}_4,<mspace\; width="1em"></mspace>{\mathrm{PCl}}_4^{+}$

2. Diamond, silicon carbide

3. ${\mathrm{NH}}_3,<mspace\; width="1em"></mspace>{\mathrm{PH}}_3$

4. ${\mathrm{XeF}}_4,<mspace\; width="1em"></mspace>{\mathrm{XeO}}_4$

Find the decreasing order of stability of O₂, O₂⁻, O₂⁺ , and O₂²⁻.

1. O₂⁺ > O₂ > O₂⁻ > O₂²⁻
2. O₂²⁻ > O₂⁻ > O₂ > O₂⁺
3. O₂ > O₂⁺ > O₂²⁻ > O₂⁻
4. O₂⁻ > O₂²⁻ > O₂⁺ > O₂

The pair of compounds that can exist together is

1. FeCl₃, SnCl₂             

2. HgCl₂, SnCl₂

3. FeCl₂, SnCl₂             

4. FeCl₃, KI

Which among the following species has a triangular planar shape?

Dipole-induced dipole interactions are present in which of the following pairs?

1. H₂O and alcohol                       

2. Cl₂ and CCl₄

3. HCl and He atoms                     

4. SiF₄ and He atoms

Which one of the following molecules contain no $\mathrm{\pi }$ -bond?

1. CO₂

2. H₂O

3. SO₂

4. NO₂

Which one of he following pairs is isostructural (i.e., having the same shape and

hybridization)?

1. [BCl₃ and BrCl₃]

2. [NH₃ and ${\mathrm{NO}}_3^{-}$]

3. [NF₃ and BF₃]

4. [${\mathrm{BF}}_4^{-}$ and ${\mathrm{NH}}_4^{+}$]

Which of the following species contains three bond pairs and one lone pair around the

central atom?

1. H₂O                           

2. BF₃

3. ${\mathrm{NH}}_2^{-}$                           

4. PCl₃