The paramagnetic species is

• SiO₂

• TiO₂

• BaO₂

• KO₂

In terms of polar character which one of the following orders is correct?

• H₂S < NH₃ < H₂O < HF

• H₂O < NH₃ < H₂S < HF

• HF < H₂O < NH₃ < H₂S

• NH₃ < H₂O < HF < H₂S

The bond lenght (pm) of F₂, H₂, Cl₂ and I₂, respectively is:

• 144, 74, 199, 267

• 74, 144, 199, 267

• 74, 267, 199, 144

• 144, 74, 267, 199

Which one of the following statement is correct for d⁴ ions [ P = pairing energy]

• When Δ₀ > P, low-spin complex form

• When Δ₀ < P, low-spin complex form

• When Δ₀ > P, high-spin complex form

• When Δ₀ > P, both high and low-spin complex form

The species having pyramidal shape according to VSEPR theory is

• SO₃

• BrF₃

• SiO${}_3^{2-}$

• OsF₂

The correct statement about ICl₅ and ICl${}_4^{-}$ is:

• ICl₅ is trigonal bipyramidal and ICl${}_4^{-}$ is tetrahedral

• ICl₅ is square pyramidal and ICl${}_4^{-}$ is tetrahedral

• both are isostructural

• ICl₅ is square pyramidal and ICl${}_4^{-}$ is square planar.

377.

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]^-