PAPER - B
Date : 26th June 2016
Sub : Chemistry
CH – 2
MM:40
Batch : 11TH GSEB|SEM - I
1. The shortest wavelength in hydrogen spectrum of Lyman series when RH = 109678 cm-1 is
(a)
1002.7 Å
(b)
1215.67 Å
(c)
1127.30 Å
(d)
911.7 Å
2. The frequency of the radiation emitted when the electron falls from n = 4 to n = 1 in a hydrogen
atom will be (Given ionization energy of H = 2.18 × 10-18 J atom-1 and h = 6.625 10-34 J s)
(a)
1.54 × 1015 s-1
(b)
1.03  1015 s-1 (c)
3.08  1015+ s-1 (d)
2.0  1015 s-1
3. If RH represents Rydberg constant, then the energy of the electron in the ground state of
hydrogen atom is :
(a)

hc
RH
(b)
1
RH ch

(c)
-RHch
(d)

RH c
h
4. In which of the following series, the lines obtained are included in atomic spectrum’s visible
range ?
(a)
Lyman
(b)
Balmer
(c)
Pascher
(d)
Brackett
5. Calculate energy of one mole of photon whose frequency of radiation is 4  1014 Hz.
(a)
159.0 KJ mol-1 (b)
169.0 KJ mol-1 (c)
158.0 KJ mol-1 (d)
168.0 kJ mol-1
6. According to Bohr’s theory of hydrogen atom, which of the following is quantized for an
electron is :
(a)
Angular momentum (b)
angular acceleration (c) acceleration (d)
velocity
7. By which name the particles of electromagnetic radiation are known ?
(a)
Photon
(b)
Meson
(c)
Positron
(d)
Graviton
8. What will be approximate energy of one mole photon having frequency 250 second-1 ?
(a)
1 Joule
(b)
1 eV
(c)
1 erg
(d)
1 eV
9. Emission of light from any element in a gaseous state is known as ……………..
(a)
Line spectra
(b)
atomic spectra (c)
emission spectra (d) all of the above
10. When ni = 3 and nf = 4, 5, … in hydrogen spectrum, then lines in which series will be observed ?
(ni = Initial state, nf = Final state)
(a)
Lyman
(b)
Balmer
(c)
Paschen
(d)
Brackett
11. An electron from one Bohr stationary orbit can go to next higher orbit :
(a)
By emission of electromagnetic radiation
(b)
By adsorption of electromagnetic radiation
(c)
By absorption of electromagnetic radiation of particular frequency
(d)
without emission or absorption of electromagnetic radiation
12. Light of which colour of spectrum is emitted in emission spectra of hydrogen atom ?
(a)
Light pink
(b)
Light purple (c)
light red
(d)
light green
13. The splitting of the spectral lines under the influence of magnetic field is called :
(a)
photoelectric effect
(b)
Zeeman effect
(c)
diffraction
(d)
interference
14. If the frequency of photon is v then velocity of photon is directly proportional to :
(a)
v
2
(b)
c
1
2
(c)
v-1
(d)
v
15. Which of the following is the correct formula for one Einstein ?
(a)
Nc

(b)
hc

(c)
E
hc
(d)
2nd Floor, Rajcastle, Near Kalpataru, Ellora Park, Baroda – 390007 Ph: +91-265-3053166
Nh
c
1
PAPER - B
Date : 26th June 2016
Sub : Chemistry
CH – 2
MM:40
Batch : 11TH GSEB|SEM - I
16. Ratio of energy of a photon of wave length of 3000 Å and 6000 Å is :
(a)
3:1
(b)
1:2
(c)
2:1
(d)
1:3
17. 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 =
1
2
2
(b)
1 = 2
(c)
1 = 2 2
(d)
1 = 4 2
18. The value of Planck’s constant is 6.63 × 10-34Js. The speed of light us 3 × 1017 nm s-1. Which value
is closest to the wavelength in nanometer of a quantum of light with frequency of 6 × 1015 s-1 ?
(a)
10
(b)
25
(c)
50
(d)
75
19. When the frequency of the incident radiation on a metallic plate is doubled, KE of the
photoelectrons will be :
(a)
doubled
(b)
halved
(d)
Increases but less the doubled
(c)
more than doubled
20. The frequency of light emitted for the transition n = 4 to n = 2 of He+ is equal to the transition in
H atom corresponding to which of the following :
(a)
n = 3 to n = 1 (b)
n = 2 to n = 1 (c)
n = 3 to n = 2 (d)
n = 4 to n = 3
21. 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 =
1
2
2
(b)
1 = 2
(c)
1 = 2 2
(d)
1 = 4 2
22. The value of Planck’s constant is 6.63 × 10-34Js. The speed of light us 3 × 1017 nm s-1. Which value
is closest to the wavelength in nanometer of a quantum of light with frequency of 6 × 1015 s-1 ?
(a)
10
(b)
25
(c)
50
(d)
75
23. When the frequency of the incident radiation on a metallic plate is doubled, KE of the
photoelectrons will be :
(a)
doubled
(b)
halved
(d)
Increases but less the doubled
(c)
more than doubled
24. The frequency of light emitted for the transition n = 4 to n = 2 of He+ is equal to the transition in
H atom corresponding to which of the following :
(a)
n = 3 to n = 1 (b)
n = 2 to n = 1 (c)
n = 3 to n = 2 (d)
n = 4 to n = 3
25. The shortest wavelength in hydrogen spectrum of Lyman series when RH = 109678 cm-1 is
(a)
1002.7 Å
(b)
1215.67 Å
(c)
1127.30 Å
(d)
911.7 Å
26. The frequency of the radiation emitted when the electron falls from n = 4 to n = 1 in a hydrogen
atom will be (Given ionization energy of H = 2.18 × 10-18 J atom-1 and h = 6.625 10-34 J s)
(a)
1.54 × 1015 s-1
(b)
1.03  1015 s-1 (c)
3.08  1015+ s-1 (d)
2.0  1015 s-1
27. If RH represents Rydberg constant, then the energy of the electron in the ground state of
hydrogen atom is :
(a)

hc
RH
(b)

1
RH ch
(c)
-RHch
(d)

RH c
h
28. In which of the following series, the lines obtained are included in atomic spectrum’s visible
range ?
(a)
Lyman
(b)
Balmer (c)
Pascher
(d)
Brackett
2nd Floor, Rajcastle, Near Kalpataru, Ellora Park, Baroda – 390007 Ph: +91-265-3053166
2
PAPER - B
Date : 26th June 2016
Sub : Chemistry
CH – 2
MM:40
Batch : 11TH GSEB|SEM - I
29. Calculate energy of one mole of photon whose frequency of radiation is 4  1014 Hz.
(a)
159.0 KJ mol-1 (b)
169.0 KJ mol-1 (c)
158.0 KJ mol-1 (d)
168.0 kJ mol-1
30. According to Bohr’s theory of hydrogen atom, which of the following is quantized for an
electron is :
(a)
Angular momentum (b)
angular acceleration (c) acceleration (d)
velocity
31. Who proposed the theory of wave nature of light ?
(a)
Max Plank
(b)
Einstein (c)
Davisson and Germer
(d)
Huygens
32. Plank constant h = 6.626  10-34Js and velocity of light is 3  108 m s-1, then what will be the
approximate wavelength of photon of radiation having frequency 8  1015 s-1 ?
(a)
5  10-18 nm
(b)
3  107 nm
(c)
3.75  10 nm
2  10-25 nm
(d)
33. The product of frequency of light and wavelength is equal to…………….
(a)
Rydberg’s constant
(b)
Plank’s constant
(c)
energy of photon
(d)
velocity of light
34. What is correct for total energy € of an electron in the atom ?
(a)
E<0
(b)
E>0
(c)
E=0
(d)
E < 0 or E > 0
35. Which of the following transitions result in Lyman series lines ?
(a)
KM
(b)
LN
(c)
L, M, N  K (d)
K  L, M, N
36. According to Bohr’s theory, the angular momentum of an electron of 5 orbit is :
th
(a)
5h
2.5h
(b)


(c)
5
5
(d)
25h

37. The energy of electron revolving in permissible orbit (n) of hydrogen atom is :
(a)
En =
 2 2 m 2 e 2
n2h2
(b)
En =
 2 2 me 4
nh 2
(c)
En =
 2 2 me 4
n2h2
(d)
En =
 2 2 me 4
n2h2
(b)
energy of the electron remains constant
38. In Bohr’s stationary orbits :
(a)
electrons move emitting radiation
(c)
angular momentum of the electron changes
(d)
electrons do not move.
39. The frequency in sec-1 of a radiation having a wavelength of 2000 Å is :
(a)
6  1015
(b)
1.5  10-15
(c)
1.5  1015
(d)
4.5  10-15
40. Which of the following statements is incorrect ?
(a)
particle nature of light can explain black body radiation
(b)
Wave nature of light can explain interference
(c)
Particle of light is known as positron
(d)
light acts as a wave and as a stream of particles
2nd Floor, Rajcastle, Near Kalpataru, Ellora Park, Baroda – 390007 Ph: +91-265-3053166
3
PAPER - B
Date : 26th June 2016
Sub : Chemistry
CH – 2
MM:40
Batch : 11TH GSEB|SEM - I
2nd Floor, Rajcastle, Near Kalpataru, Ellora Park, Baroda – 390007 Ph: +91-265-3053166
4