Which of the following is not correct with respect to bond length

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 Multiple Choice QuestionsMultiple Choice Questions

121.

The number of sigma (σ) and pi (π) bonds present in 1, 3, 5, 7-octatetraene respectively are

  • 14 and 3

  • 17 and 4

  • 16 and 5

  • 15 and 4


122.

The molecule that contains only sp2 hybrid carbon atoms is

  • isoprene

  • acrylonitrile

  • but-1-ene

  • 1,3-butadiene


123.

Among the following, the molecule of highest dipole moment is

  • CCl4

  • NH3

  • H2O

  • CHCl3


124.

The incorrectly matched pair, among the following is-

  • BrF5 - Trigonal bipyramidal

  • SF4 - See-saw

  • ClF3 - T-shape

  • NH3 - Trigonal pyramidal


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125.

Which one of the following has the shortest bond length?

  • C - H

  • C - N

  • C - F

  • C - C


126.

Pick out the wrong statement.

  • Nitrogen has the ability to form pπ-pπ bonds with itself

  • Bismuth forms metallic bonds in elemental state

  • Catenation tendency is higher in nitrogen when compared with other elements of the same group

  • Nitrogen has higher first ionization enthalpy when compared with other elements of the same group


127.

The wrong statement about the interstitial compounds is

  • their melting points are lower than those of pure metals

  • they retain metallic conductivity

  • they are chemically inert

  • their bonds are neither ionic non covalent


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128.

Which of the following is not correct with respect to bond length of the species? 

  • C2C22-

  • B2+ > B2

  • Li2+ > Li2

  • O2 > O2-


D.

O2 > O2-

Greater the bond order, shorter is the bond length.

 Bond order  1bond length

(i) Electronic configuration and bond order of C2 and C22- ions-

C2 : KK σ2s2, σ*2s2π2px2, π2py2

Bond order = 12(6 - 2) = 2

C22- : KK σ2s2, σ*2s2π2px2, π2py2, σ2pz2

Bond order = 12 (8 - 2) = 3

 The order of bond length : C2 > C22-

(ii) Electronic configuration and bond orders of B2+ and B-

B2 : KK σ2s2, σ*2s2π2px1, π2py1

Bond order = 12(4 - 2) = 1

B2+ : KK σ2s2, σ*2s2π2px1

Bond order = 12 (3 - 2) = 12

 The order of bond length : B2+ > B2

(iii) Electronic configuration and bond order of Li2 and Li2+

Li2 : KK σ2s2

Bond order = 12( 2 - 0) = 1

Li2+ : KK σ2s1

Bond order = 12( 1 - 0) = 12

The order of bond length : Li2+ > Li2

(iv) Electronic configuration and bond order of O2 and O2-

O2 : KK σ2s2, σ*2s2σ2pz2 , π2px2 , π2py2 , π*2px1 , π*2py1

Bond Order = 12 ( 8 - 4) = 2

O2- : KK σ2s2, σ*2s2, σ2pz2π2px2 , π2py2 , π*2px2 , π*2py1

Bond order = 12( 8 - 5) = 1.5

 The correct order of bond length = O2- > O2


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129.

Substance which is weakly repelled by a magnetic field is

  • O2

  • H2O

  • CrO2

  • Fe3O4


130.

The bonds present in the structure of dichromate ion are

  • four equivalent Cr-O bonds only

  • six equivalent Cr-O bonds and one Cr - O - O bond

  • six equivalent Cr-O bonds and one O-O bond

  • eight equivalent Cr-O bonds


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