Which one of the following sets of ions represents a collection

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 Multiple Choice QuestionsMultiple Choice Questions

11.

The bond dissociation energy of B–F in BF3 is 646 kJ 1 mol whereas that of C-F in CF4 is 515 kJ 1 mol.The correct reason for higher B-F bond dissociation energy as compared to that of C-F is

  • Smaller size of B-atom as compared to that of C- atom

  • Stronger σ bond between B and F in BF3 as compared to that between C and F in CF4

  • Significant pπ - pπ interaction between B and F in BF whereas there is no possibility of such 3 interaction between C and F in CF4 

  • Significant pπ - pπ interaction between B and F in BF whereas there is no possibility of such 3 interaction between C and F in CF4 

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12.

Which one of the following constitutes a group of the isoelectronic species?

  • straight C subscript 2 superscript 2 minus end superscript comma space straight O subscript 2 superscript minus comma space CO comma space NO
  • NO to the power of plus comma space straight C subscript 2 superscript 2 minus end superscript comma CN to the power of minus comma space straight N subscript 2
  • CN to the power of minus comma space straight N subscript 2 comma space straight O subscript 2 superscript 2 minus end superscript comma space straight C subscript 2 superscript 2 minus end superscript
  • CN to the power of minus comma space straight N subscript 2 comma space straight O subscript 2 superscript 2 minus end superscript comma space straight C subscript 2 superscript 2 minus end superscript
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13.

Which one of the following pairs of species has the same bond order?

  • CN and NO+

  • CN and CN+

  • O2 and CN

  • O2 and CN

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14.

Which of the following hydrogen bonds is the strongest?

  • O – H …… N

  • F – H …… F

  • O – H ….. O

  • O – H ….. O

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15.

Which of the following molecules/ions does not contain unpaired electrons?

  • straight O subscript 2 superscript 2 minus end superscript
  • straight B subscript 2
  • straight N subscript 2 superscript plus
  • straight N subscript 2 superscript plus
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16.

Among the following mixtures, dipole-dipole as the major interaction is present in

  • benzene and ethanol

  • acetonitrile and acetone

  • KCl and water

  • KCl and water

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17.

Which one of the following sets of ions represents a collection of isoelectronic species?

  • K+ , Cl , Ca2+, Sc3+

  • Ba2+, Sr2+, K+ , S2–

  • N3–, O2–, F , S2–

  • N3–, O2–, F , S2–


A.

K+ , Cl , Ca2+, Sc3+

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18.

In which of the following molecules/ions are all the bonds not equal?

  • SF4

  • SiF4

  • XeF4

  • XeF4

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19.

Nickel (Z = 28) combines with a uninegative monodentate ligand X–
to form a paramagnetic complex [NiX4 ]2 −. The number of unpaired electron(s) in the nickel and geometry of this complex ion are,
respectively

  • one, tetrahedral

  • two, tetrahedral

  • one, square planar

  • one, square planar

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20.

In Fe(CO)5, the Fe – C bond possesses 

  •  π-character only

  • both σ and π characters

  • ionic character

  • ionic character

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