The correct bond order in the following species is

1. ${\mathrm{O}}_2^{2+}>{\mathrm{O}}_2^{+}>{\mathrm{O}}_2^{-}$

2. ${\mathrm{O}}_2^{2+}<{\mathrm{O}}_2^{-}<{\mathrm{O}}_2^{+}$

3. ${\mathrm{O}}_2^{+}>{\mathrm{O}}_2^{-}<{\mathrm{O}}_2^{2+}$

4. ${\mathrm{O}}_2^{-}<{\mathrm{O}}_2^{+}>{\mathrm{O}}_2^{2+}$

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. ${\mathrm{SiCl}}_4, {\mathrm{PCl}}_4^{+}$

2. Diamond, silicon carbide

3. ${\mathrm{NH}}_3, {\mathrm{PH}}_3$

4. ${\mathrm{XeF}}_4, {\mathrm{XeO}}_4$

Decreasing order of stability of ${\mathrm{O}}_2, {\mathrm{O}}_2^{-}, {\mathrm{O}}_2^{+} \mathrm{and} {\mathrm{O}}_2^{2-} \mathrm{is:}$

1. ${\mathrm{O}}_2^{+} > {\mathrm{O}}_2 > {\mathrm{O}}_2^{-} > {\mathrm{O}}_2^{2-}$

2. ${\mathrm{O}}_2^{2-} > {\mathrm{O}}_2^{-} > {\mathrm{O}}_2^{} > {\mathrm{O}}_2^{+}$

3. ${\mathrm{O}}_2^{} > {\mathrm{O}}_2^{+} > {\mathrm{O}}_2^{2-} > {\mathrm{O}}_2^{-}$

4. ${\mathrm{O}}_2^{-} > {\mathrm{O}}_2^{2-} > {\mathrm{O}}_2^{+} > {\mathrm{O}}_2^{}$

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