ATOMIC STRUCTURE

CHEMISTRY
Target
IIT-JEE 2023 D P P

COURSE: JEE Nurture H-atom Spectrum No. 3

DPP-3
H-Atom Spectrum
Multiple Choice Questions with only one correct answer
1. In the emission line spectra of hydrogen atom, C 9. If the shortest wavelength of H atom in Lyman A
how many lines can be accounted for by all series is x, then longest wave length in Balmer
possible electron transition from 5th energy levels series of He+ is:
within the atom: 9x 36x x 5x
(A) 4 (B) 5 (C) 10 (D) 20 (A) (B) (C) (D)
5 5 4 9
2. The field created by moving electron: C
10. Lines in an atomic emission spectrum of an C
(A) Only magnetic field
element are due to
(B) Only electrical field
(A) Excitation of electrons from lower energy
(C) Magnetic as well as electrical field
levels to higher energy levels
(D) None of these
(B) Energy of electrons
3. What will be the longest wavelength line in D (C) Excited electrons dropping from higher energy
Balmer series of levels to lower energy levels
(A) 566 nm (B) 556 nm (D) Nuclear charges
(C) 546 nm (D) 656 nm
11. A certain line in the atomic spectrum of hydrogen B
4. With increasing number the energy difference A
corresponds to  = 4861Ǻ. Between what energy
between adjacent energy levels in atoms: levels according to Bohr’s theory does the
(A) Decreases (B) Increase transiton occur? RH = 10967 cm-1
(C) remains constant
(A) 2  1 (B) 4  2
(D) Decreases for low Z, increases for high Z
(C) 4 1 (D) 4  3
5. The wave number of first line of Balmer series of D
12. What is the change in the orbital radius when the C
hydrogen atom is 15200 cm-1. What is the wave
electron in the hydrogen atom undergoes the first
number of first line of Balmer series of Li3+ ion
Paschen transtion? Radius of the first Bohr orbit =
will be:
5.28 x 10– 11m.
(A) 15200 cm -1 (B) 6080 cm-1
(A) 4.23x10 –10 m (B) 6.35x10 –10 m
(C) 76000 cm (D) 136800 cm-1
-1
–10
(C) 3.7x10 m (D) 1.587x10 –10 m
6. Line spectra is characteristic of: B 13. Suggest two transition in the atomic spectrum D
(A) molecules (B) atoms hydrogen for which the wave number ratio is
(C) radicals (D) none 108:7
7. In a hydrogen atom, the transition takes place A (A) first Lyman and first Bracket transition
from n = 3 to n = 2. If Rydberg’s constant is (B) first and second Lyman transiton
1.097x107 m–1, the wavelength of the emitted (C) first Lyman and first Balmer transition
radiation is: (D) first Lyman and first Paschen transition
(A) 6564 Ǻ (B) 6064 Ǻ 14. Whenever a hydrogen atom emits a photon in B
(C) 6664 Ǻ (D) 5664 Ǻ the Balmer series
8. What is the difference in wavelengths of the 4th A (A) it may emit another photon in the Balmer
and 5th lines of the Balmer Series in the spectrum series
of the atomic hydrogen? (B) it may emit another photon in the Lyman
(A) 131 Ǻ (B) 520 Ǻ series
(C) 390 Ǻ (D) 262 Ǻ (C) the second photon, if emitted will have a
wavelength of about 122nm
(D) it may emit a second photon, but the
wavelength of this photon cannot be predicted

Ranjeet Shahi M.Tech, Ph.D IIT-DELHI 1

Allen Career Institute
dare to pursue your dream to become an achiever
 Daly Practice Paper “Atomic Structure”

15. A hydrogen atom in an excited state emits a D Answer

photon which has the longest wavelength of the (1) C (2)C (3)D (4)A (5)D (6)B
Paschen series. Further emissions from the atom (7)A (8)A (9)A (10)C (11)B (12)C
cannot include the (13)D (14)B (15)D (16)D (17)A (18)C
(A) longest  of the Lyman series (19)D (20)B
(B) second longest  of the Lyman series “Success is the sum of small efforts,
(C) longest  of the Balmer series repeated day in and day out.”
(D) second longest  of the Balmer series
16. The frequency v of a certain line of Lyman series D
of the atomic spectrum of hydrogen satisfies the
following conditions. Identify the transition
I. It is the sum of the frequencies of another
Lyman line and a Balmer line.
II. It is the sum of the frequencies of a certain
Lyman line, a Balmer line and a pashchen line
(A) 3 1 (B) 3 2
(C) 42 (D) 41
17. If the energy of a photon is equal to the difference A
between the energies of an excited state and
ground state, it has large probability of being
absorbed by an atom in the ground state. A beam
of ultraviolet radiation having wavelength between
100 nm and 200 nm is incident on a sample of
atomic hydrogen gas. Assuming that the atoms
are in ground state, which wavelength will have
low intensity in the transmitted beam.
(A) 122 nm, 103nm (B)122 Ǻ , 103 Ǻ
(C) 61 Ǻ, 51 Ǻ (D) none
18. Wave number of the second line of Paschen series C
for H-atom is (R=109700cm-1)
(A) 18750 cm-1 (B)3452 cm-1
(C) 7801 cm -1 (D) 1542656 cm-1
19. Suppose that a hypothetical H-like atom gives a D
red , green , blue and violet line spectrum. Which
jump according to figure would give off the red
spectral line.

(A) 31 (B) 21

(C) 41 (D) 32

20. Energy level A, B, C of a certain atom correspond B

to increasing values of energy EA, EB, EC. If 1,
2 and 3 are the wavelengths for the electronic
transition CB, BA, CA respectively, they
are related as :
λ1 λ 2
(A) 3 = 1 + 2 (B) 3 =
λ1 + λ 2
(C) λ 23 = λ12 + λ 22 (D) 1 + 2 + 3 = 0

Ranjeet Shahi M.Tech, Ph.D IIT-DELHI 2

Allen Career Institute
dare to pursue your dream to become an achiever