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

2. Diamond, silicon carbide

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

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

Decreasing order of stability of ${\mathrm{O}}_2,<mspace\; width="1em"></mspace>{\mathrm{O}}_2^{-},<mspace\; width="1em"></mspace>{\mathrm{O}}_2^{+}<mspace\; width="1em"></mspace>\mathrm{and}<mspace\; width="1em"></mspace>{\mathrm{O}}_2^{2-}<mspace\; width="1em"></mspace>\mathrm{is:}$

1. ${\mathrm{O}}_2^{+}<mspace\; width="1em"></mspace>><mspace\; width="1em"></mspace>{\mathrm{O}}_2<mspace\; width="1em"></mspace>><mspace\; width="1em"></mspace>{\mathrm{O}}_2^{-}<mspace\; width="1em"></mspace>><mspace\; width="1em"></mspace>{\mathrm{O}}_2^{2-}$

2. ${\mathrm{O}}_2^{2-}<mspace\; width="1em"></mspace>><mspace\; width="1em"></mspace>{\mathrm{O}}_2^{-}<mspace\; width="1em"></mspace>><mspace\; width="1em"></mspace>{\mathrm{O}}_2^{}<mspace\; width="1em"></mspace>><mspace\; width="1em"></mspace>{\mathrm{O}}_2^{+}$

3. ${\mathrm{O}}_2^{}<mspace\; width="1em"></mspace>><mspace\; width="1em"></mspace>{\mathrm{O}}_2^{+}<mspace\; width="1em"></mspace>><mspace\; width="1em"></mspace>{\mathrm{O}}_2^{2-}<mspace\; width="1em"></mspace>><mspace\; width="1em"></mspace>{\mathrm{O}}_2^{-}$

4. ${\mathrm{O}}_2^{-}<mspace\; width="1em"></mspace>><mspace\; width="1em"></mspace>{\mathrm{O}}_2^{2-}<mspace\; width="1em"></mspace>><mspace\; width="1em"></mspace>{\mathrm{O}}_2^{+}<mspace\; width="1em"></mspace>><mspace\; width="1em"></mspace>{\mathrm{O}}_2^{}$

A molecule having the maximum dipole moment among the following is -

1. CO₂

2. CH₄

3. NH₃

4. NF₃

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

Paramagnetic species among the following is:

1. CO               

2. ${\mathrm{O}}_2^{-}$

3. CN^-               

4. NO⁺

The correct order of solubility in an aqueous medium is: 

1. CuS > ZnS > Na₂S

2. ZnS > Na₂S > CuS

3. Na₂S > CuS > ZnS

4. Na₂S > ZnS > CuS

XeF₂ is isostructural with : 

1. TeF₂

2. ICI₂^-

3. SbCl₃

4. BCl₃