01 CET11 QB Atomic Structure Questi

Topics: Quantum mechanics, Atomic orbital, Atom Pages: 7 (1908 words) Published: November 30, 2014
CET11 Chemistry Question Bank – Atomic Structure

1.

The energies, E1 and E2 of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths i.e., 1 and 2 will be
(a) 1 

2.

1
2
2

(c) 1  22

(b) 1  2

(d) 1  42

When the electron of a hydrogen atom jumps from n  4 to n  1 state, the number of spectral lines emitted is
(a) 15

3.

(c) 6

(d) 3

The wavelength of which series lie towards the ultraviolet region? (a) Lyman

4.

(b) 9

(b) Balmer

(c) Paschen

(d) None of these

The statement that does not belong to Bohr’s model of atom, is (a) The energy of the electrons in the orbit is quantised
(b) The electron in the orbit nearest to the nucleus is in lowest energy state (c) The electrons revolve in difference orbits around the nucleus (d) The electron emit energy during revolution due to the presence of Columbic forces of attraction

5.

Which of the following pairs is isoelectronic?
(a) Ne, Cl

6.

9.

(d) N 3 , Na

(b) 12

(c) 15

(d) 18

(d) 4

(d) 5

Number of unpaired electrons in Mn3 is
(a) 2

8.

(c) Mg 2 , K 

Number of spectral lines of electron when it jumps from sixth level to first level, is (a) 9

7.

(b) Ca 2 , F 

(b) 3

 1
1 
 
For the Paschen series the values of n1 and n2 in the expression, E  RH hc   n2 n2 
 1
2 
(a) n1  1, n2  2,3, 4,.....

(b) n1  2, n2  3, 4,5,.....

(c) n1  3, n2  4,5,6,.....

(d) n1  4, n2  5,6,7,.....

What are the values of n1 and n2 respectively for H  line in the Lyman series of hydrogen atomic spectrum?
(a) 3 and 5

(b) 2 and 3

(c) 1 and 3

10. Splitting of spectral lines under the influence of magnetic field is called (a) Zeeman effect

(b) Starck effect

(c) Photoelectric effect

(d) None of these

11. Deflection back of a few particles on hitting thin foil of gold shows that (a) Nucleus is heavy

(b) Nucleus is small

(c) Both (a) and (b)

(d) Electron create hindrance in the movement of   particles

1

(d) 2 and 4

CET11 Chemistry Question Bank – Atomic Structure

12. The scientist who proposed the atomic model based on the quantization of energy for the first time is
(a) Max Planck

(b) Neil’s Bohr

(c) de-Broglie

(d) Heisenberg

13. Electron density in the YZ plane of 3d x2  y 2 orbital is (a) Zero

(b) 0.50

(c) 0.75

(d) 0.90

(c) CN  , CO

(d) SO2 , CO2

14. Which of the following is isoelectronic?
(a) CO2 , NO2

(b) NO2 , CO2
o

o

15. The energy ratio of a photon of wavelength 3000 A and 6000 A is (a) 1:1

(b) 2:1

(c) 1:2

(d) 1:4

(c) 10, 8769 cm1

(d) 10, 8976 cm1

16. The value of Rydberg constant is
(a) 10, 9678 cm1

(b) 10, 9876 cm1

17. The first emission line on hydrogen atomic spectrum in the Balmer series appears at (R  Rydberg constant)
(a)

5R 1
cm
36

(b)

3R 1
cm
4

(c)

7 R 1
cm
144

(d)

9R
cm1
400

18. The lightest particle is
(a)   particle

(b) position

(c) proton

(d) neutron

19. Bohr model can explain
(a) the solar spectrum
(b) the spectrum of hydrogen molecule
(c) spectrum of any atom or ion containing one electron only (d) the spectrum of hydrogen atom only
20. The energy of hydrogen atom in its ground state is -13.6 eV. The energy of the level corresponding to the quantum number n  5 is
(a) -5.4 eV

(b) -0.54 eV

(c) -2.72 eV

(d) -0.85 eV

21. The radius of second Bohr’s orbit of hydrogen atom is
(a) 0.053 nm

(b) 0.106 nm

(c) 0.2116 nm

(d) 0.4256 nm

22. Particle nature of electron was experimentally demonstrated by (a) Max Bon

(b) J.J. Thomson

(c) de-Broglie

(d) Schrodinger

(c) neutron

(d) alpha

23. The ratio of charge and mass would be greater for
(a) proton

(b) electron

24. Which of the following transitions have minimum wavelength? (a) n4  n1

(b) n2  n1

(c) n4  n2

(d) n3  n1

25....
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