Which of the following changes in the respective bond order value

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 Multiple Choice QuestionsMultiple Choice Questions

101.

Which of the following pair have identical bond order?

  • CN- and NO+

  • CN- and O2-

  • CN- and CN+

  • NO+ and O2-


102.

Hybridisation of carbon is CH3-

  • sp2

  • sp3

  • sp3d

  • sp3d2


103.

The common features among CO, CN- and NO2+ are

  • Bond order three and isoelectronic.

  • Bond order three and weak field ligands.

  • Bond order two and π-acceptors.

  • Bond order three and π-donors.


104.

Identify the T-shaped molecule from the following.

  • BF3

  • NH3

  • NF3

  • CIF3


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105.

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

  • H2O

  • BeF2

  • NH3

  • NF3


106.

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)


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107.

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


D.

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

Electronic configuration of N2 (total electrons = 14)

σ1s2, σ*1s2, σ2s2, σ*2s2π2px2  π2py2, σ2pz2

Electronic configuration of F2 (total electrons = 18)

σ1s2, σ*1s2, σ2s2, σ*2s2, σ2pz2π2px2π2py2, π*2px2π*2py2

For N2, the valence orbital is bonding molecular orbital and for F2, it is antibonding molecular orbital. So, bond order decrease by 0.5 in the former and increase by 0.5 in the latter.


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108.

The hybridised state of bromine in bromine pentafluoride is

  • sp3d

  • dsp3

  • d2sp3

  • sp3d2


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109.

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


110.

Arrange the following species in the correct order of their stability

C2, Li2, O2+, He2+

  • Li2 < He2+ < O2+ < C2

  • C2 < O2+ < Li2 < He2+

  • He2+ < Li2 < C2 < O2+

  • O2+ < C2 < Li2 < He2+


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