661.

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

• H₂O

• BF₃

• NH₂^-

• NH₂^-

The pair of species with t he same bond order is 

• O₂^2-, B₂

• O₂⁺, NO⁺

• NO, CO

• NO, CO

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

• [BCl₃ and BrCl₃]

• [NH₃ and NO₃^-]

• [NF₃ and BF₃]

• [NF₃ and BF₃]

During the change of O₂ to O₂^- ion, the electron adds on which one of the following orbitals?

• π* orbital

• π orbital

• σ* orbital

• σ* orbital

Four diatomic species are listed below. Identify the correct order in which the bond order is increasing in them.

• NO< O₂^-<C₂^2- < He₂⁺

•  O₂^- <NO< C₂^2- < He₂⁺

• C₂^2- < He₂⁺ <O₂^- <NO

• C₂^2- < He₂⁺ <O₂^- <NO

Which of the two ions from the list given below have the geometry that is explained by the same hybridization of orbitals

The Correct order of increasing bond length of C - H, C-O, C - C and C = C is

• C - C < C=C < C - O < C - H

• C - O < C - H < C - C < C = C

• C - H < C - O <  C - C < C= C

• C - H  < C = C < C - O < C - C

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