The number of lone pairs of electrons on the central atoms of H2O

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 Multiple Choice QuestionsMultiple Choice Questions

41.

The number of σ and π bonds between two carbon atoms in calcium carbide are

  • one σ, one π

  • one σ, two π

  • two σ, one π

  • one σ, 112π


42.

An element X belongs to fourth period and fifteenth group of the periodic table. Which of the following statements is true?

  • It has completely filled s-orbital and a partially filled d-orbital.

  • It has completely filled s-and p -orbitals and a partially filled d-orbital.

  • It has completely filled s- and p-orbitals and a half filled d-orbital.

  • It has a half filled p -orbital and completely filled s-and d-orbitals.


43.

Of the following molecules, which have shape similar to CO2?

  • HgCl2

  • SnCl2

  • C2H2

  • NO2


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44.

The number of lone pairs of electrons on the central atoms of H2O, SnCl2, PCl3 and XeF2 respectively are

  • 2, 1, 1, 3

  • 2, 2, 1, 3

  • 3, 1, 1, 2

  • 2, 1, 2, 3


A.

2, 1, 1, 3

The number of lone pairs of electrons on the central atoms of H2O, SnCl2, PCl3 and XeF2 are 2, 1, 1 and 3 respectively.

 Number of lone pairs = 2

Cl-Sn..-Cl Number of lone pairs = 1

 Number of lone pair = 1

 Number of lone pairs = 3


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45.

In the following compound, the number of sp-hybridised carbons are

CH2=C=CH-CH(CN)-C≡CH

  • 2

  • 3

  • 4

  • 5


46.

The correct order of decreasing H-C-H angle in the following molecule is

     

  • I> II> III

  • II> I> III

  • III> II> I

  • I> III> II


47.

The correct order of decreasing length of the bond as indicated by the arrow in the following structures is

       

  • I >II > III

  • II > I > III

  • III > II > I

  • I > III > II


48.

In SOCl2, the Cl-S-Cl and Cl-S O bond angles are

  • 130° and 115°

  • 106° and 96°

  • 107° and 108°

  • 96° and 106°


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49.

In O2 and H2O2 , the O-O bond lengths are 1.21 and 1.48 Å respectively. In ozone, the average O-O bond length is

  • 1.28 Å

  • 1.18 Å

  • 1.44 Å

  • 1.52 Å


50.

In diborane, the number of electrons that accounts for bonding in the bridges is

  • six

  • two

  • eight

  • four


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