Which of the following pair have identical bond order?

• CN^- and NO⁺

• CN^- and O${}_2^{-}$

• CN^- and CN⁺

• NO⁺ and O${}_2^{-}$

Hybridisation of carbon is CH${}_3^{-}$

• sp²

• sp³

• sp³d

• sp³d²

The common features among CO, CN^- and NO${}_2^{+}$ are

• Bond order three and isoelectronic.

• Bond order three and weak field ligands.

• Bond order two and $\mathrm{\pi }$-acceptors.

• Bond order three and $\mathrm{\pi }$-donors.

Identify the T-shaped molecule from the following.

• BF₃

• NH₃

• NF₃

• CIF₃

105.

Which one of the following molecules has the least dipole moment?

• H₂O

• BeF₂

• NH₃

• NF₃

Dipole-dipole interaction energy between polar molecules in solids depends on the radius of the molecule (r) and it is directly proportional to

• (1/r³)

• (1/r⁶)

• (1/r)

• (1/r⁵)

Which of the following changes in the respective bond order values are caused by removal of an electron from N₂ and F₂ molecules?

• Decrease by 0.5 in both

• Increase by 0.5 in both

• Increase by 0.5 in the former and decrease by 0.5 in the latter

• Decrease by 0.5 in the former and increase by 0.5 in the latter

The hybridised state of bromine in bromine pentafluoride is

• sp³d

• dsp³

• d²sp³

• sp³d²

The correct ascending order of ligand field strength of the given ligands is

• F^- < I^- < CN^- < H₂O < CO

• I^- < F^- < H₂O < CO < CN^-

• I^- < F^- < H₂O < CN^- < CO

• F^- < H₂O < I^- < CN^- < CO

Arrange the following species in the correct order of their stability

C₂, Li₂, O${}_2^{+}$, He${}_2^{+}$

• Li₂ < He${}_2^{+}$ < O${}_2^{+}$ < C₂

• C₂ < O${}_2^{+}$ < Li₂ < He${}_2^{+}$

• He${}_2^{+}$ < Li₂ < C₂ < O${}_2^{+}$

• O${}_2^{+}$ < C₂ < Li₂ < He${}_2^{+}$