The wavelength of the radiation emitted, when in hydrogen atom e

Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 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

385 Views

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

221 Views

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

308 Views

Advertisement
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

733 Views

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

327 Views

Advertisement

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


A.

91 nm

317 Views

Advertisement
Advertisement
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)


Advertisement