For an electron impossible combination of quantum number is from

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 Multiple Choice QuestionsMultiple Choice Questions

151.

Number of α and β emitted in the reaction, 92U238 → 82Pb206 are

  • 6α and 8β

  • 8α and 6β

  • 6α and 4β

  • 4α and 6β


152.

Which of the following can be used to convert N714 into O817?

  • Deutron

  • Proton

  • α-particle

  • Neutron


153.

Which of the following describes the shape of orbital?

  • Principal quantum number

  • Azimuthal quantum number

  • Magnetic quantum number

  • Spin quantum number


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154.

For an electron impossible combination of quantum number is

  • n = 3; l = 2; ml = -2; ms = +12

  • n = 3; l = 2; ml = -3; ms = +12

  • n = 4; l = 0; ml = 0; ms = -12

  • n = 5; l = 3; ml = 0; ms = -12


B.

n = 3; l = 2; ml = -3; ms = +12

Among the given options, option b is the incorrect option.

The particular set of quantum numbers is not permitted, because if the value of l is 2, then value of m never be -3.


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155.

The energy of an electron in nth orbit of hydrogen atom is

  • 13.6n4eV

  • 13.6n3eV

  • -13.6n2eV

  • 13.6neV


156.

Which of the following is not iso-electronic?

  • Na+

  • Mg2+

  • O2-

  • Cl-


157.

Which of the following equations represent de-Broglie relation?

  • hmv=p

  • λm =vp

  • λ=hmp

  • λ=hmv


158.

Which of the following sequences of the energy levels of the subshells related to principal quantum number four (n = 4)?

  • s< p< d< f

  • s< d< p< f

  • s< f< p< d

  • p< s< d< f


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159.

The correct electronic configuration of iron is

  • 1s2, 2s2 2p6,3s3p6, 4s2, 3d6

  • 1s2, 2s2 2p6,3s3p6, 4s2, 3d5

  • 1s2, 2s2 2p6,3s3p6, 4s2, 3d7

  • 1s2, 2s2 2p6,3s3p6, 4s2, 3d5


160.

Which of the electronic shell of the following elements is not rounded?

  • He

  • Be

  • B

  • Li


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