Among the following mixtures, dipole-dipole as the major interac

Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 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 

292 Views

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
192 Views

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

179 Views

14.

Which of the following hydrogen bonds is the strongest?

  • O – H …… N

  • F – H …… F

  • O – H ….. O

  • O – H ….. O

158 Views

Advertisement
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
242 Views

Advertisement

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


B.

acetonitrile and acetone

243 Views

Advertisement
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–

136 Views

18.

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

  • SF4

  • SiF4

  • XeF4

  • XeF4

139 Views

Advertisement
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

197 Views

20.

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

  •  π-character only

  • both σ and π characters

  • ionic character

  • ionic character

315 Views

Advertisement