The wave number of the spectral line in the emission spectrum of

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

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


Advertisement

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


A.

n =3 to n =1

Wave number of spectral line in emission spectrum of hydrogen

v- = RH1n12-1n22  ...(i)Given, v- =89 RHOn putting the value of v- in Equatio.(i), we get89 RH= RH1n12-1n2289= 1(1)2-1n2289-1= -1n2213=1n22n2 = 3Hence, electron jumps from n2= 3 to n1= 1


Advertisement
Advertisement
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


208.

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

  • 4

  • 7

  • 5

  • 6


Advertisement
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


Advertisement