Atoms — DPP 3

20 NEET questions from Atoms, with answers and explanations. Attempt it as a timed test to get scoring, accuracy breakdown and mistake tracking.

Attempt this test free 20 questions · 30 minutes · +80 marks
1
In Balmer series of spectrum of hydrogen first four lines with different wavelength $\mathrm { H } _ { \alpha } , \mathrm { H } _ { \beta } , \mathrm { H } _ { \gamma } , \mathrm { H } _ { \delta }$ are obtained. Which line has maximum frequency out of these.
  1. A $\mathrm { H } _ { \alpha }$
  2. B $\mathrm { H } _ { \beta }$
  3. C $\mathrm { H } _ { \gamma }$
  4. D $\mathrm { H } _ { \delta }$
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Correct answer: D

2
The ionization energy of the electron in the hydrogen atom in its ground state is 13.6 eV. The atoms are excited to higher energy level to emits radiations of 6 wavelengths. Maximum wavelength of emitted radiation corresponds to the transition between:
  1. A n = 3 and n = 2 states
  2. B n = 3 and n = 1 states
  3. C n = 2 and n = 1 states
  4. D n = 4 and n = 3 states
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Correct answer: D

3
What key concept about atomic structure was introduced by Rutherford's model?
  1. A Electrons are the most massive part of the atom.
  2. B Atoms are mostly empty space.
  3. C Atoms cannot be divided.
  4. D Electrons are fixed in place.
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Correct answer: B

4
If the wavelength of the first line of the Balmer series of hydrogen is 6561Å, then the wavelength of the second line of the series should be:
  1. A 13122 Å
  2. B 3280 Å
  3. C 4860 Å
  4. D 2187 Å
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Correct answer: C

5
In a head on collision between an $\alpha$-particle and gold nucleus, the closest distance of approach is 41.3 fm. Calculate the energy of α-particle. (z of gold = 79)
  1. A 5.51 eV
  2. B 5.51 MeV
  3. C 5.51 J
  4. D 5.51 KJ
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Correct answer: B

6
An α-particle of energy 5 MeV is scattered through $180 ^ { \circ }$ by a fixed uranium nucleus. The Closest distance is of the order of
  1. A $1 \AA$
  2. B $10 ^ { - 10 } \mathrm {~cm}$
  3. C $10 ^ { - 12 } \mathrm {~cm}$
  4. D $10 ^ { - 16 } \mathrm {~cm}$
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Correct answer: C

7
An electron jumps from the $4 ^ { \text {th } }$ orbit to the $2 ^ { \text {nd } }$ orbit of hydrogen atom. Given the Rydberg's constant $\mathrm { R } = 10 ^ { 5 } \mathrm {~cm} ^ { 21 }$. The frequency in Hz of the emitted radiation will be-
  1. A $\frac { 3 } { 16 } \times 10 ^ { 5 }$
  2. B $\frac { 3 } { 16 } \times 10 ^ { 15 }$
  3. C $\frac { 9 } { 16 } \times 10 ^ { 15 }$
  4. D $\frac { 3 } { 4 } \times 10 ^ { 15 }$
Show answer

Correct answer: C

8
A stationary hydrogen atom emits photon corresponding to the first line of Lyman series. If R is the Rydberg's constant and M is the mass of the atom, then the velocity acquired by the atom is (neglect energy absorbed by the photon)
  1. A $\frac { 3 R h } { 4 M }$
  2. B $\frac { 4 M } { 3 R h }$
  3. C $\frac { R h } { 4 M }$
  4. D $\frac { 4 M } { R h }$
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Correct answer: A

9
According to de Broglie, the wavelength associated with a moving particle is given by:
  1. A $\lambda = m v$
  2. B $\lambda = \frac { h } { p }$
  3. C $\lambda = \frac { p } { h }$
  4. D $\lambda = \frac { h } { m v ^ { 2 } }$
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Correct answer: B

10
According to Bohr's atomic model, electrons revolve around the nucleus in:
  1. A Random orbits
  2. B Fixed circular orbits
  3. C Elliptical orbits
  4. D Spiral orbits
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Correct answer: B

11
Which of the following transition in Balmer series for hydrogen atom will have longest wavelength?
  1. A n = 2 to n = 1
  2. B n = 6 to n = 1
  3. C n = 3 to n = 2
  4. D n = 6 to n = 2
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Correct answer: C

12
The wavelength of the first spectral line in the Balmer series of hydrogen atom is $6561 \AA$. The wavelength of the second spectral line in the Balmer series of singly ionized helium atom is:
  1. A $1215 \AA$
  2. B $1640 \AA$
  3. C $2430 \AA$
  4. D $4687 \AA$
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Correct answer: A

13
The largest wavelength in the UV region of the hydrogen spectrum is 122 nm. The smallest wavelength in the infrared region of the hydrogen spectrum (to the nearest integer is):
  1. A 802 nm
  2. B 823 nm
  3. C 1882 nm
  4. D 1648 nm
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Correct answer: B

14
The first spectral series was discovered by:
  1. A Balmer
  2. B Lyman
  3. C Paschen
  4. D Pfund
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Correct answer: A

15
An alpha particle of energy $\frac { 1 } { 2 } \mathrm { mv } ^ { 2 }$ bombards a heavy nuclear target of charge Ze. Then the distance of closest approach for the alpha particle will be proportional to
  1. A $\frac { \mathrm { l } } { \mathrm { v } }$
  2. B $\frac { 1 } { \mathrm { Ze } }$
  3. C $v ^ { 2 }$
  4. D $\frac { 1 } { \mathrm {~m} }$
Show answer

Correct answer: D

16
As the n (number of orbit) increases, the difference of energy between the consecutive energy levels
  1. A remains the same
  2. B increases
  3. C decreases
  4. D sometimes increases and sometimes decreases
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Correct answer: C

17
The angular momentum of the electron in third orbit of hydrogen atom, if the angular momentum in the second orbit of hydrogen atom is L is
  1. A L
  2. B 3 L
  3. C (3/2)L
  4. D (2/3)L
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Correct answer: C

18
The energy required to excite an electron from n = 2 to n = 3 energy state is 47.2 eV. The charge number of the nucleus, around which the electron revolves, will be
  1. A 5
  2. B 10
  3. C 15
  4. D 20
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Correct answer: A

19
The angular momentum (L) of an electron moving in a stable orbit around nucleus is:
  1. A Half integral multiple of $\frac { \mathrm { nh } } { 2 \pi }$
  2. B Integral multiple of $\frac { \mathrm { n } ^ { 2 } \mathrm {~h} } { 2 \pi }$
  3. C Integral multiple of $\frac { h } { 2 \pi }$
  4. D Half integral multiple of h
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Correct answer: C

20
Which quantity is quantized in Bohr's model of the atom?
  1. A Linear momentum
  2. B Kinetic energy
  3. C Angular momentum
  4. D Potential energy
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Correct answer: C

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