If p is the momentum of the fastest electron ejected from a metal

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 Multiple Choice QuestionsMultiple Choice Questions

261.

Which one of the following about an electron occupying the 1s orbital in a hydrogen atom is incorrect? (The Bohr radius is represented by a0).

  • The electron can be found at a distance 2a0 from the nucleus.

  • The probability density of finding the electron is maximum at the nucleus.

  • The total energy of the electron is maximum when it is at a distance a0 from the nucleus.

  • The magnitude of the potential energy is double that of its kinetic energy on a an average.


262.

Hinsberg’s reagent is:

  • C6H5SO2Cl

  • SOCl2

  • (COCl)2

  • C6H5COCl


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263.

If p is the momentum of the fastest electron ejected from a metal surface after the irradiation of light having wavelength λ, then for 1.5 p momentum of the photoelectron, the wavelength of the light should be: (Assume kinetic energy of ejected photoelectron to be very high in comparison to work function) :

  • 23λ

  • 49λ

  • 34λ

  • 12λ


B.

49λ

W0 is too small in comparision to K.E. K.E= P22mhcλ=P22mhcλN=P22m(1.5)2λNλ=1(1.5)2λN= 49λ


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264.

The degenrate orbitals of [Cr(H2O)6]3+ are

  • dyz and dz2

  • dx2 and dxz

  • dxz and dyz

  • dx2-y2 and dxy


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265.

Among the following, the molecule expected to be stabilized by anion formation is: 

C2, O2, NO and F2

  • NO

  • C2

  • F2

  • O2


266.

For any given series of spectral lines of atomic hydrogen, let v = vmax - vmin be the difference in maximum and minimum frequencies in cm-1. The ratio vBalmer is:

  • 4 : 1

  • 9 : 4

  • 5 : 4

  • 27.5


267.

The graph between Ψ2 and r(radial diatance) is shown beow . This represents

               

  • 2s orbital

  • 2p orbital

  • 3s orbital

  • 1s orbital


268.

The ratio of the shortest wavelength of two spectral series of hydrogen spectrum is found to be about 9. The spectral series are:

  • Paschen and Pfund

  • Lyman and Paschen

  • Brackett and Pfund

  • Balmer and Brackett


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269.

Two electrons occupying the same orbital are distinguished by

  • Magnetic quantum number

  • Azimuthal quantum number

  • Spin quantum number

  • Spin quantum number

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270.

Magnetic moment 2.84 BM is given by (At. no. Ni= 28, Ti= 22, Cr=24, Co = 27)

  • Ni2+

  • Ti3+

  • Cr3+

  • Cr3+

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