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 Multiple Choice QuestionsMultiple Choice Questions

1.

The species in which the N atom is in a state of sp hybridization is:

  • NO2-

  • NO3-

  • NO2

  • NO2

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2.

The ionic radii (in Å) of N3–, O2– and F are respectively:

  • 1.36, 1.40 and 1.71

  • 1.36, 1.71 and 1.40

  • 1.71, 1.40 and 1.36

  • 1.71, 1.40 and 1.36


C.

1.71, 1.40 and 1.36

Number of electrons in N3- = 7+3 = 10
Number of electrons in O2- = 8+2 = 10
Number of electrons in F- = 9+1 = 10
Since, all the three species have each 10 electrons hence they are isoelectronic species.
It is considered that, in case of isoelectronic species as the negative charge increase, ionic radii increase and therefore the value of ionic radii are

N3- = 1.71 (highest among the three)
O2- = 1.40
F- = 1.36 (lowest among the three)

N3- > O2-> F-



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3.

In which of the following pairs of molecules/ions, both the species are not likely exist?

  • straight H subscript 2 superscript plus comma space He subscript 2 superscript 2 minus end superscript
  • straight H subscript 2 superscript minus comma space He subscript 2 superscript 2 minus end superscript
  • straight H subscript 2 superscript 2 plus end superscript comma He subscript 2
  • straight H subscript 2 superscript 2 plus end superscript comma He subscript 2
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4.

Which of the following exists as covalent crystals in the solid state?

  • Iodine

  • Silicon

  • Sulphur

  • Sulphur

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5.

Stability of the species Li2, Li2 and Li2+ increases in the order of:

  • Li2 < Li2+ < Li2-

  • Li2 < Li2+ < Li2 

  • Li2< Li2 < Li2+

  • Li2< Li2 < Li2+

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6.

In which of the following pairs the two species are not isostructural?

  • CO32- and NO3-

  • PCl+4 and SiCl4

  • PF5 and BrF5

  • PF5 and BrF5

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7.

Among the following, the maximum covalent character is shown by the compound

  • FeCl2

  • SnCl2

  • AlCl3

  • AlCl3

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8.

The hybridization of orbitals of N atom in NO3-, NO2+ and NH4+ are respectively

  • sp, sp2,sp3

  • sp2 , sp, sp

  • sp, sp3 , sp2

  • sp, sp3 , sp2

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9.

The group having isoelectronic species is

  • O2– , F, Na+ , Mg2+

  • O– , F, Na, Mg+

  • O2–, F, Na ,Mg2+

  • O2–, F, Na ,Mg2+

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10.

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

  • O22+

  • O2+

  • O2

  • O2

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