The spin only magnetic moment of Fe2+ ion (in BM) is approximatel

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 Multiple Choice QuestionsMultiple Choice Questions

201.

When the azimuthal quantum number has the value of 2, the number of orbitals possible are

  • 7

  • 5

  • 0

  • 3


202.

The correct set of four quantum numbers for outermost electron of potassium (Z = 19) is

  • 4, 1, 0, 12

  • 3, 1, 0, 12

  • 4, 0, 0, 12

  • 3, 0, 0, 12


203.

A body of mass x kg is moving with a velocity of 100 ms-1. Its de-Broglie wavelength is 6.62 × 10-35 m. Hence, x is (h = 6.62 × 10-34 Js)

  • 0.1 kg

  • 0.25 kg

  • 0.15 kg

  • 0.2 kg


204.

The wave number of the spectral line in the emission spectrum of hydrogen will be equal to 89 times the rydberg's constant if the electron jumps from

  • n =3 to n =1

  • n = 10 to n=1

  • n=9 to n=1

  • n = 2 to n=1


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205.

The set of quantum numbers for the outermost electron for copper in its ground state is

  • 4, 1, 1 +1/2

  • 3, 2, 2, +1/2

  • 4, 0, 0, +1/2

  • 4, 2, 2, +1/2


206.

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


207.

If the energies of the two photons in the ratio of 3 : 2, their wavelength will be in the ratio of

  • 2 : 3

  • 9 : 4

  • 3 : 2

  • 1 : 2


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208.

The spin only magnetic moment of Fe2+ ion (in BM) is approximately

  • 4

  • 7

  • 5

  • 6


C.

5

Fe2+ - [Ar] 3d6

d6 has 4 unpaired electrons. Therefore,

μ = n (n + 2)   = 4 (4 + 2)   = 24

    = 4.89 BM ≈ 5 BM


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209.

In an alkaline medium, glycine predominantly exists as/ in a/ an

  • cation

  • anion

  • Zwitter ion

  • covalent form


210.

Which one of the followmg has no unpaired electrons?

  • O2-

  • O2+

  • O22-

  • O2


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