Among Me3N, C5H5N and MeCN (Me = methyl group) the electronegativ

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 Multiple Choice QuestionsMultiple Choice Questions

31.

Which one of the following has the regular tetrahedral structure?

  • XeF4

  • [Ni(CN)4]2-

  • BF4-

  • BF4-

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32.

Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them?

  • (n -1)d8 ns2

  • (n-1)d5 ns2

  • (n-1)d3 ns2

  • (n-1)d3 ns2

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33.

The maximum number of 90° angles between bond pair of electrons is observed in

  • dsp3 hybridization

  • sp3d2 hybridization

  • dsp2 hybridization

  • dsp2 hybridization

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34.

According to molecular orbital theory, which of the following will not be a viable molecule?

  • H22-

  • He22+

  • He2+

  • H2-


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35.

Which of the following compounds contain(s) no covalent bond(s)?
KCl, PH3, O2, B2H6, H2SO4

  • KCl, B2H6

  • KCl, B2H6, PH3

  • KCl, H2SO4

  • KCl


36.

Total number of lone pair of electrons in  I3ion is

  • 12

  • 3

  • 6

  • 9


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37.

Among Me3N, C5H5N and MeCN (Me = methyl group) the electronegativity of N is in the order

  • MeCN > C5H5N > Me3N

  • C5H5N > Me3N > MeCN

  • Me3N > MeCN > C5H5N

  • Electronegativity same in all


A.

MeCN > C5H5N > Me3N

In Me3N → N is sp3-hybrid

In C5H5N → N is sp2 hybrid

And in MeCN → N is sp-hybrid.

Also, electronegativity of any element α% s- character in hybrid orbitals.

Thus, order of electronegativity for nitrogen is MeCN > C5H5N < Me3N.


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38.

The shape of XeF5- will be

  • square pyramid

  • trigonal bipyramidal

  • planar

  • pentagonal bipyramid


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39.

The ground state magnetic property of B2 and C2 molecules will be

  • B2 paramagnetic and C2 diamagnetic

  • B2 diamagnetic and C2 paramagnetic

  • Both are diamagnetic

  • Both are paramagnetic


40.

The correct order of O-O bond lenght in O2, H2O2, and O3

  • O2> O3> H2O2

  • H2O2 > O3 > O2

  • O3> O2> H2O2

  • O3 > H2O2> O2


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