Given: The mass of electron is 9.11 x 10-31 kgPlanck constant is

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291.

Given: The mass of electron is 9.11 x 10-31 kg
Planck constant is 6.626 x 10-34 Js,
the uncertainty involved in the measurement of velocity within a distance of 0.1 A is:

  • 5.79 x 106 ms-1

  • 5.79 x 107 ms-1

  • 5.79 x 108 ms-1

  • 5.79 x 108 ms-1


A.

5.79 x 106 ms-1

By Heisenberg's uncertainty principle

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292.

The orientation of an atomic orbital is governed by:

  • azimuthal quantum number

  • spin quantum number

  • magnetic quantum number

  • magnetic quantum number

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293.

Which one is the wrong statement?

  • de-Broglie's wavelength is given by λ = h/mv,
    where m = mass of the particle, v = group velocity of the particle

  • The uncertainty principle is increment straight E space straight x space increment straight t space greater or equal than space fraction numerator straight h over denominator 4 straight pi end fraction

  • Half-filled and fully filled orbitals have greater stability due to greater exchange energy, greater symmetry and more balanced arrangement

  • Half-filled and fully filled orbitals have greater stability due to greater exchange energy, greater symmetry and more balanced arrangement

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294.

Which one is a wrong statement?

  • Total orbital angular momentum of electron in 's' orbital is equal to zero

  • An orbital is designated by three quantum numbers while an electron in an atom is designated by four quantum numbers

  • The value of m for dz2 is zero

  • The electronic configuration of N atom is


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295.

Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is 1s2 2s2 2p3, the simplest formula for this compound is

  • Mg2X3

  • MgX2

  • Mg3X2

  • Mg2X


296.

Among the following set of quantum numbers, the impossible set is

  • n l m s
    3 2 -3 -1/2
  • n l m s
    4 0 0 1/2
  • n l m s
    5 3 0 -1/2
  • n l m s
    3 2 -2 1/2

297.

Match the type of series given in Column I with the wavelength range given in Column II and choose the correct option.
Column I Column II
A Lyman 1. Ultraviolet
B. Paschen 2. Near-infrared
C. Balmer 3. Far Infrared
D. Pfund 4. Visible

  • A B C D
    1 2 4 3
  • A B C D
    4 3 1 2
  • A B C D
    3 1 2 4
  • A B C D
    4 3 2 1

298.

The electrons identified by quantum numbers n and l, are as follows

  1. n =4, l=1
  2. n = 4, l = 0

  3. n =3, l= 2

  4. n = 3, l = 1

If we arrange them in order of increasing energy, i.e., from lowest to highest, the correct order is

  • IV<II<III<I

  • II<IV<I<III

  • I < III < II < IV

  • III < I < IV < II


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299.

What will be the number of waves formed by a Bohr electron in one complete revolution in its second orbit?

  • Three

  • Two

  • One

  • Zero


300.

Match the particle with its characteristic
Column I Column II
A. α-particle p. Slow moving
B. Isobar q. High penetration power
C. γ- ray r. Same atomic mass
D. β- particle s. consists of electron

  • A - p; B - r; C - q; D - s

  • A - p; B - q; C - r; D - s

  • A - r; B - s; C - p; D - q

  • A - s; B - r; C - p; D - q


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