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CRT-3 Xii (As) 26-11-24

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10 views

CRT-3 Xii (As) 26-11-24

Arhnmvbnmfgsnsnmxncn Hdjdmndmmdgsjsv Gsjdj Ghdkkdk Gdhjsmn Yhjdmd Fgdkkd Behu FK

Uploaded by

chemistrywithshyam
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CLASSROOM TEST - 03

Class XII Date : 26-11-2024 Topic : Atomic Structure

1. Which one of the series of hydrogen spectrum is in the

visible region

(a) Lyman series (b) Balmer series

(c) Paschen series (d) Bracket series


2. The energy levels of the hydrogen spectrum is shown in
figure. There are some transitions A, B, C, D and E.
Transition A, B and C respectively represent

(a) First member of Lyman series, third spectral line of Balmer


series and the second spectral line of Paschen series
(b) Ionization potential of hydrogen, second spectral line of
Balmer series and third spectral line of Paschen series
(c) Series limit of Lyman series, third spectral line of Balmer
series and second spectral line of Paschen series
(d) Series limit of Lyman series, second spectral line of Balmer
series and third spectral line of Paschen series
3. Energy levels A, B, C of a certain atom corresponding to
increasing values of energy i.e. E A  EB  EC . If 1,  2 ,  3
are the wavelengths of radiations corresponding to the
transitions C to B, B to A and C to A respectively, which of
the following statements is correct
(a)  3  1   2
1 2
(b)  3 
1   2
(c) 1   2   3  0
(d) 23  21  22
4. An electron jumps from the 4th orbit to the 2nd orbit of

hydrogen atom. Given the Rydberg's constant R  10 5 cm 1.

The frequency in Hz of the emitted radiation will be

3 3
(a)  10 5 (b)  1015
16 16

9 3
(c)  1015 (d)  1015
16 4
5. In any Bohr orbit of the hydrogen atom, the ratio of kinetic

energy to potential energy of the electron is

(a) 1/2 (b) 2

(c)  1/ 2 (d) – 2
6. The spectral series of the hydrogen spectrum that lies in

the ultraviolet region is the

(a) Balmer series (b) Pfund series

(c) Paschen series (d) Lyman series


7. When a hydrogen atom is raised from the ground state to

an excited state

(a) P.E. increases and K.E. decreases

(b) P.E. decreases and K.E. increases

(c) Both kinetic energy and potential energy increase

(d) Both K.E. and P.E. decrease


8. Hydrogen atoms are excited from ground state of the

principal quantum number 4. Then the number of spectral

lines observed will be

(a) 3 (b) 6

(c) 5 (d) 2
9. Hydrogen atom emits blue light when it changes from n = 4

energy level to the n = 2 level. Which colour of light would

the atom emit when it changes from the n = 5 level to the n

= 2 level

(a) Red (b) Yellow

(c) Green (d) Violet


10. The first line of Balmer series has wavelength 6563 Å.

What will be the wavelength of the first member of Lyman

series

(a) 1215.4 Å (b) 2500 Å

(c) 7500 Å (d) 600 Å

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