The number of antibonding electron pairs in O22- molecular i

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 Multiple Choice QuestionsMultiple Choice Questions

71.

Which of the following is correct comparison of the stability of the molecules?

  • CN < O2+

  • CN = N2

  • N2 < O2

  • H2+ > He2+


72.

Dipole moment of HCl = 1.03 D, HI = 0.38 D. Bond length of HCl = 1.3 A° and HI= 1.6 Α°.  The ratio of fraction of electric charge, δ, existing on each atom in HCl and HI is

  • 12: 1

  • 2.7: 1

  • 3.3: 1

  • 1: 3.3


73.

SiCl4 on hydrolysis forms 'X' and HCl Compound 'X' loses water at l000°C and gives 'Y'. Compounds 'X' and 'Y' respectively are

  • H2SiCl6, SiO2

  • H4SiO4, Si

  • SiO2, Si

  • H4SiO4, SiO2


74.

In TeClthe central atom tellurium involves :

  • sp3 hybridisation 

  • sp3d hybridisation 

  • sp3d2 hybridisation 

  • dsp2 hybridisation 


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75.

A coordiante bond is a dative covalent bond. Which of the below is true?

  • Three atom form bond by sharing their electrons

  • Two atom form bond by sharing their electrons

  • Two atoms form bond and one of them provides both electrons

  • Two atoms form bond by sharing electrons obtained from third atom


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76.

The number of antibonding electron pairs in O22- molecular ion on the basis of molecular orbital theory is

  • 2

  • 3

  • 4

  • 5


C.

4

O22- according to molecular orbital theory and count number of electron pairs in antibonding molecular orbitals.

      O22- = 8 + 8 + 2 = 18= σ1s2, σ*1s2, σ2s2, σ*2s2, σ2pz2, π2px2, π2py2, π*2px2, π*2py2Antibonding electron pairs are  σ*1s2, σ*2s2, π*2px2, π*2py2Total 4 antibonding electron pairs are there


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77.

Which of the following is isostructural with CO2 ?

  • N2O

  • NO2

  • N2O5

  • NO


78.

Structure of ammonia is

  • pyramidal

  • tetrahedral

  • trigonal

  • trigonal pyramidal


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79.

Which of the following contains both covalent and ionic bond ?

  • CCl4

  • CaCl2

  • NH4Cl

  • H2O


80.

The bond energy is the energy required to

  • dissociate one mole of the substance

  • dissociate bond in 1 kg of the substance

  • break one mole of similar bonds

  • break bonds in one mole of substance


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