Chemical Bonding and Molecular Structure

HF has highest boiling point among hydrogen halides, because it has:

• Strongest van der Waal’s interactions

• Lowest ionic character

• Strongest hydrogen bonding

• Lowest dissociation enthalpy

Among the following molecules/ ions, 

${\mathrm{C}}_2^{2-}, {\mathrm{N}}_2^{2-}, {\mathrm{O}}_2^{2-}, {\mathrm{O}}_2$

Which one is diamagnetic and has the shortest bond length?

• ${\mathrm{O}}_2^{2-}$

• C${}_2^{2-}$

• N${}_2^{2-}$

• O₂

The correct statement among I to III are:

(I) Valence bond theory cannot explain the color exhibited by transition metal complexes.

(II) Valence bond theory can predict quantitatively the magnetic properties of transition metal complexes.

(III) Valence bond theory cannot distinguish ligands as weak and strong field ones.

• (I) and (III) only

• (II) and (III) only

• (I), (II) and (III)

• (I) and (II) only

The ion that has sp³d² hybridization for the central atom, is:

• [ICl₄]^-

• [ICl₂]^-

• [IF₆]^-

• [BrF₂]^-

During the change of O₂ to O${}_2^{-}$, the incoming electrons goes to the orbital;

• π^*2P_x

• π2P_x

• σ*2P_x

• π2P_y