Assuming that Hund's rule in violated,the bond order and magnetic

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

471.

The dipole moment of HBr is 2.60 x 10-30 Cm and the interatomic spacing is 1.41 A .The percent ionic character of HBr is:

  • 11.5%

  • 10.1%

  • 8.2%

  • 4.1%


472.

Which of the following gives correct arrangement of compounds involved based on their bond strength ?

  • HF > HCl > HBr > HI

  • HI > HBr > HCl > HF

  • HF > HBr > HCl > HI

  • HCl > HF > HBr > HI


473.

H-bond is strongest in

  • C2H5OH

  • H-F

  • H2O

  • CH3COCH3


474.

Hybridization of 1 and 2 carbon atom in

C1H2C2 = CHare

  • sp, sp

  • sp2, sp2

  • sp2, sp

  • sp3, sp2


Advertisement
475.

The hybridisation and shape of IF5 are respectively:

  • sp3d , trigonal bipyramide

  • sp3d , see saw

  • sp3d , square pyramidal

  • sp3d , pentagonal pyramidal


476.

Number of orbitals in L energy level

  • 1

  • 2

  • 3

  • 4


Advertisement

477.

Assuming that Hund's rule in violated,the bond order and magnetic nature of the  diatomic molecule B2 is:

  • 1 and diamagnetic

  • 0 and diamagnetic

  • 1 and paramagnetic

  • O and paramagnetic


A.

1 and diamagnetic

B2 : Total electrons = 10

Configuration : σ1s2 , σ* 1s2 ,  σ2s2 , σ* 2s2 ,  π2px1  π2py1

If Hund's rule is violated, then

σ1s2 , σ* 1s2 ,  σ2s2 , σ* 2s2 ,  π2px2  π2py0

So, diamagnetic bond order = 6-42 = 1


Advertisement
478.

Using MO theory, predict which of the following species has the shortest bond length?

  • O22+

  • O2+

  • O2-

  • O22-


Advertisement
479.

The shape of an orbital is determined by

  • n

  • l

  • m

  • s


480.

The enthalpies of all elements in their standard states are

  • zero

  • >0

  • <0

  • unity


Advertisement