Important Questions of Chemical Bonding and Molecular Structure Chemistry | Zigya

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371.

The paramagnetic species is

  • SiO2

  • TiO2

  • BaO2

  • KO2


372.

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


373.

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


374.

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


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375.

The species having pyramidal shape according to VSEPR theory is

  • SO3

  • BrF3

  • SiO32-

  • OsF2


376.

The correct statement about ICl5 and ICl4- is:

  • ICl5 is trigonal bipyramidal and ICl4- is tetrahedral

  • ICl5 is square pyramidal and ICl4- is tetrahedral

  • both are isostructural

  • ICl5 is square pyramidal and ICl4- 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


378.

Among the following molecules/ ions, 

C22-, N22-, O22-, O2

Which one is diamagnetic and has the shortest bond length?

  • O22-

  • C22-

  • N22-

  • O2


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379.

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


380.

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

  • [ICl4]-

  • [ICl2]-

  • [IF6]-

  • [BrF2]-


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