Highest energy will be absorbed to eject out the electron in the

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301.

Highest energy will be absorbed to eject out the electron in the configuration.

  • 1s22s22p1

  • 1s22s22p3

  • 1s22s22p2

  • 1s22s22p4


B.

1s22s22p3

Highest electric will be absorbed to eject out the electron in the configuration of 1s22s22p3


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302.

If n = 6, the correct sequence for filling of electrons will be

  • ns (n - 1)d (n - 2)f np

  • ns (n - 2)f np (n - 1)d

  • ns np (n - 1)d (n - 2)f

  • ns (n - 2)f (n - 1)d np


303.

An electron is moving in Bohr's fourth orbit. Its de-Broglie wave length is λ. What is the circumference of the fourth orbit?

  • 2λ

  • 2λ

  • 4λ 

  • 4λ


304.

The Vividh Bharti Station of All India Radio, Delhi, broadcasts on a frequency of 1,368 kHz (Kilohertz). Calculate the wavelength (λ) of the electromagnetic radiation emitted by transmitter. Which part of the electromagnetic spectrum does it belong to?

  • 319.4 m and X-rays

  • 319.4 m and radiowave

  • 219.3 m and microwave

  • 219.3 m and radiowave


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305.

In an atom, an electron is moving with a speed of 600 m/s with an accuracy of 0.005%. Certainty with which the position of the electron can be located is

(Given, h= 6.6 x 10-34 kg m2 s-1, mass of electron em = 9.1 x 10-31 kg)

  • 215 x 10-3 m

  • 2.78 x 10-3 m

  • 1.92 x 10-3 m

  • 3.24 x 10-3 m


306.

Maximum number of electrons in a subshell of an atom determined by the following?

  • 4l + 2

  • 2n2

  • 4l - 2

  • 2l + 1


307.

Which one of the following sets of quantum numbers represents the highest energy level in an atom?

  • n = 4; l = 0; m = 0; s = +12

  • n = 3; l = 1; m = 1; s = +12

  • n = 3; l = 2; m = -2; s = +12

  • n = 3; l = 0; m = 0; s = +12


308.

The ratio of the difference in energy between the first and the second Bohr orbit to that between the second and the third Bohr orbit is

  • 12

  • 13

  • 49

  • 275


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309.

Which of the following has the maximum number of unpaired electrons?

  • V3+

  • Fe2+

  • Mn2+

  • Cu+


310.

The geometry of XeF6 is

  • planar hexagon

  • regular octahedron

  • distorted octahedron

  • square bipyramid


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