The correct order of decreasing dipole moment of (I) toluene, (II

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 Multiple Choice QuestionsMultiple Choice Questions

341.

Aluminium chloride exists as dimer, Al2Cl6, in solid state as well as in solution of non-polar solvents such as benzene. When dissolved in water, it gives

  • Al3+ + 3Cl-

  • [Al(H2O6]3+ + Cl-

  • [Al(HO)6]3- + 3HCl

  • Al2O3 + 6HCl


342.

Where of the O2-, O22-, BN and NN is/are paramagnetic ?

  • NN

  • O22-

  • BN

  • O2-


343.

Which of the following is not true?

  • In a first order reaction, the half-life is independent to the initial concentration of reactant.

  • A given piece of charcoal shows increase in its surface area in its powdered form.

  • In valence bond of H2, each electron spends its time around its own nucleus

  • In valence bond of H2, both the electrons spend their time around both the nucleus


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344.

The correct order of decreasing dipole moment of (I) toluene, (II) m-dichlorobenzene (III) o-dichlorobenzene and (IV) p-dichlorobenzene is

  • IV < II < I < III

  • IV < I < II < III

  • I < IV < II < III

  • IV < I < III < II


B.

IV < I < II < III

Dipole moment of p-dichlorobenzene is zero, while that of o-dichlorobenzene is 2.54 D and for m-dichlorobenzene is 1.48 D. This shows that benzene ring is planar and in p-C6H4Cl2 two C-Cl bonds are directed in the plane of the ring, thus on adding, they becomes zero. In this, two C-Cl bonds contain an angle of 60° and in m- C6H4Cl2 the two C-Cl bonds contain an angle of 120° and their dipole moments on vector addition give a higher value of dipole moment.

Therefore, sequence of dipole moment is as follows:

p-dichlorobenzene < toulene < m-dichlorobenzene < o-dichlorobenzene


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345.

The polypeptides are obtained by assembling the peptide units by

  • ionic bond

  • covalent bond

  • intermolecular H-bonding

  • covalent and H-bonding


346.

Which one of the following have linear structure?

(I) I3- 

(II) NO2- 

(III) I3+ 

(IV) SO2

(V) N3-

  • I, II and III

  • I and V

  • II, III and IV

  • All of these


347.

The dipole moment of HBr is 1.6 × 10-30 cm and inter atomic spacing is 1 Å. The % ionic character of HBr is

  • 7

  • 10

  • 25

  • 27


348.

The bond order of H2- ion is 12. If it has 2 bonding electron, how many antibonding electrons it will have?

  • 4

  • 3

  • 2

  • 1


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349.

Ni2+ ion (Z= 28) contains unpaired electrons

  • 1

  • 2

  • 3

  • 5


350.

A magnetic moment of 1.73 BM will be shown by which one among the following compounds

  • [Cu(NH3)4]2+

  • [Ni(CN)4]2-

  • TiCl4

  • [CoCl6]4-


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