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

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

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 ${\mathrm{NH}}_4^{+}$]