Which of the following structures is the most preferred and hence

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 Multiple Choice QuestionsMultiple Choice Questions

61.

The sp3d2 hybridisation of central atom of a molecule would lead to

  • square planar geometry

  • tetrahedral geometry

  • trigonal bipyramidal geometry

  • octahedral geometry


62.

Hybridisation of C2 and C3 of H3C-CH=C-CH3 are

  • sp, sp3

  • sp2, sp

  • sp2, sp2

  • sp, sp


63.

Nitrogen forms stable N2 molecule, but phosphorus is converted to P4 from P2 because

  • - bonding is strong in phosphorus 

  • -  bonding is weak in phosphorus 

  • double bond is present in phosphorus

  • single P-P bond is weaker than N-N bond


64.

Which of the following ion is diamagnetic?

  • Nd3+

  • La3+

  • Tb3+

  • Er3+


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65.

An aqueous solution of titanium chloride, when subjected to magnetic measurement, show zero magnetic moment. The formula of complex in aqueous solution is

  • [Ti(H2O)6]Cl4

  • [Ti(H2O)6]Cl3

  • [Ti(H2O)5Cl]Cl2

  • [Ti(H2O)6]Cl


66.

Among [Fe(H2O)6]+, [Fe(CN)6]3-, [Fe(Cl)6]3- species, the hybridisation state of the Fe atom are, respectively.

  • d2sp3, d2sp3, sp3d2

  • sp3d2,d2sp3, d2sp3

  • sp3d2, d2sp3,sp3d2

  • None of the above


67.

Which of the following ligands is tetradentate?


68.

Some of the properties of the two species, NO3- and H3O+ are described below. Which one of them is correct?

  • Dissimilar in hybridisation for the central atom with different structures

  • Isostructural with same hybridisation for the central atom

  • Isostructural with different hybridisation for the central atom

  • Similar in hybridisation for the central atom with different structures


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69.

Which of the following structures is the most preferred and hence of lowest energy for SO3?


D.

Formal charges help in selection of the lowest energy structure from a number of possible Lewis structures for a given species. Generally the lowest energy structure is the one with the smallest formal charges on the atoms.
Formal charge on an atom
= total no. of valence electrons - non-bonding electrons - 12× bonding electrons. 

For Lewis structure of SO3

                        

Formal charge on S       = 6-0-12×12=0Formal charge on three O atoms     = 6-4-12×4=0


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70.

The pairs of species of oxygen and their magnetic behaviours are noted below. Which of the following presents the correct description?

  • O2-, O22- - Both diamagnetic 

  • O+, O22- - Both diamagnetic 

  • O2+, O2 - Both diamagnetic 

  • O, O22- - Both diamagnetic 


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