Chemical Bonding and Molecular Structure

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

• NH₃

• BF₃

• OH^-

• H₂O

Which of the following has the minimum bond length?

• O₂^-

• O₂^2-

• O₂

• O₂

Decreasing order of stability of  is

Which of the following structures is the most preferred and hence of lowest energy of SO₃ ? 

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

• SiCl_4.PCl₄⁺

• Diamond, carbide

• NH₃, PH₃

• NH₃, PH₃

In which of the following pairs of molecules/ions, the central atoms have sp² hybridization?

• NO₂^- and NH₃

• BF₃ and NO₂^-

• NH₂^- and H₂O

• NH₂^- and H₂O

Which one of the following species does not exist under normal conditions?

• Be₂⁺

• Be₂

• B₂

• B₂

In which one of the following species the central atom has the type of hybridisation which si not the same as that present in the other three? 

• SF4

• I₃^-

• SbCl₅^2-

• SbCl₅^2-

The correct order of the decreasing ionic radii among the following isoelectronic species is

• Ca²⁺ > K⁺ >S^2- > Cl^-

• Cl^- > S^2- > Ca²⁺ > K⁺

• S^2- > Cl^- > K⁺ > Ca²⁺

• S^2- > Cl^- > K⁺ > Ca²⁺

In which of the following molecules the central atom does not have sp³ hybridisation?

• CH₄

• SF₄

• BF₄^-

• BF₄^-