Consider the ground state of Cr atom (Z = 24). The number of ele

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 Multiple Choice QuestionsMultiple Choice Questions

11.

The ionization enthalpy of a hydrogen atom is 1.312 × 106Jmol−1. The energy required to excite the electron in the atom from n = 1 to n = 2 is 

  • 8.51 × 105 Jmol−1

  • 6.56 × 105 Jmol−1

  • 7.56 × 105 Jmol−1

  • 7.56 × 105 Jmol−1

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12.

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

  • n = 3, l = 1, m = 1, s = +½

  • n = 3, l = 2, m = 1, s = +½

  • n = 4, l = 0, m = 0, s = +½

  • n = 4, l = 0, m = 0, s = +½

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13.

According to Bohr’s theory, the angular momentum of an electron in 5th orbit is

  • 25h/ π

  • 1.0h/π

  • 10/π

  • 10/π

321 Views

14.

Uncertainty in the position of an electron (mass = 9.1 × 10–31 kg) moving with a velocity 300 ms–1, accurate upto 0.001%, will be

  • 19.2 × 10–2 m

  • 5.76 × 10–2 m

  • 1.92 × 10–2 m

  • 1.92 × 10–2 m

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15.

The “spin-only” magnetic moment [in units of Bohr magneton,(µB )] of Ni2+ in aqueous solution would be (Atomic number of Ni = 28) 

  • 2.84

  • 4.90

  • 1

  • 1

360 Views

16.

Which of the following sets of quantum numbers is correct for an electron in 4f orbital?

  • n = 4, I =3, m = +4, s = + 1/ 2

  • n = 3, I = 2, m = -2, S = + 1/2

  • n =4, I = 3, m = +1, s = + 1/ 2

  • n =4, I = 3, m = +1, s = + 1/ 2

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17.

Consider the ground state of Cr atom (Z = 24). The number of electrons with the azimuthal quantum numbers I =1 and 2 are respectively

  • 12 and 4

  • 16 and 5

  • 16 and 4

  • 16 and 4


D.

16 and 4

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18.

The wavelength of the radiation emitted, when in hydrogen atom electron falls from infinity to stationary state 1, would be (Rydberg constant = 1.097×107 m-1)

  • 91 nm

  • 9.1×10-8 nm

  • 406 nm

  • 406 nm

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19.

If the given four electronic configurations,

(i) n = 4, l = 1

(ii) n = 4, l = 0

(iii) n = 3, l = 2

(iv) n = 3, l = 1

are arranged in order of increasing energy, then the order will be

  • (iv) < (ii) < (iii) < (i)

  • (ii) < (iv) < (i) < (iii)

  • (i) < (iii) < (ii) < (iv)

  • (iii) < (i) < (iv) < (ii)


20.

Which of the following sets of quantum numbers represents the 19th electron of Cr(Z = 24)?

  • (4, 1, -1, +12)

  • (4, 0, 0, +12)

  • (3, 2, 0, -12)

  • (3, 2, -2, +12)


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