For an electron whose x-positional uncertainity is 1x 10-10 m, th

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 Multiple Choice QuestionsMultiple Choice Questions

321.

The wavelength of a spectral line emitted by hydrogen atom in the Lyman series is 1615Rcm.
The value of n, will be

                               [R=Rydberg constant]

  • 1

  • 2

  • 3

  • 4


322.

Which of the following have maximum number of unpaired electrons ?

  • Fe3+

  • Fe2+

  • Co2+

  • Co3+


323.

If magnetic quantum number of a given atom represented by -3, then what will be its principal quantum number ?

  • 2

  • 3

  • 4

  • 5


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324.

For an electron whose x-positional uncertainity is 1x 10-10 m, the uncertainity in the x-component of the velocity in ms-1 will be of the order of:

(Data : me = 9× 10-31 Kg , h= 6.6 × 10 -34 JS )

  • 106

  • 103

  • 1012

  • 1015


A.

106

Δx · Δp  h2π            Δν n2πΔV 6.6 × 10-34 Js2×3.14×1×10-10×9×10-31ΔV 1.1 × 106 ms-1


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325.

Total number of atoms represented by the compound CuSO4 · 5H2O is :

  • 27

  • 21

  • 5

  • 8


326.

When electrons are trapped into the crystal in anion vacancy, the defect is known as :

  • Schottky defect

  • Frenkel defect

  • stoichiometric defect

  • F-centres


327.

The correct sets of quantum numbers which represents the highest energy level in an atomis:

  • n=4 , l=0 , m=0 , s = + 12

  • n=3 , l=0 , m=0 , s = + 12

  • n=3 , l=1 , m=1 , s = + 12

  • n=3 , l=2 , m= -1 , s = + 12


328.

Wave number of a spectral line for a given transition is xcm-1 for He+ then its value for Be+ (iso electronic of H+) for same transition is:

  • x cm-1

  • 4x cm-1

  • x4cm-1

  • 2x cm-1


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329.

Ratio of radii of second and first Bohr orbits of H atom is

  • 2

  • 4

  • 3

  • 5


330.

India conducted an underground nuclear test at

  • Narora

  • Tarapur

  • Pushkar

  • Pokharan


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