JEE Mains Previous Year Questions (2021-2024): Atomic Structure | Chapter-wise Tests for JEE Main & Advanced PDF Download

 Page 1


Numerical 
 
 
JEE Main 2023 (Online) 15th April Morning Shift 
 
Q.2. The orbital angular momentum of an electron 
in    3 s orbital is . The value of X is ____________ (nearest 
integer) 
JEE Main 2023 (Online) 13th April Evening Shift 
 
Q.3. Values of work function (W0) for a few metals are given 
below 
Metal Li Na K Mg Cu Ag 
W0/eV 2.42 2.3 2.25 3.7 4.8 4.3 
 
Q.1. The total number of isoelectronic species from the given 
set is ___________. 
The number of metals which will show photoelectric effect 
when light of wavelength  400 nm falls on it is ___________ 
Page 2


Numerical 
 
 
JEE Main 2023 (Online) 15th April Morning Shift 
 
Q.2. The orbital angular momentum of an electron 
in    3 s orbital is . The value of X is ____________ (nearest 
integer) 
JEE Main 2023 (Online) 13th April Evening Shift 
 
Q.3. Values of work function (W0) for a few metals are given 
below 
Metal Li Na K Mg Cu Ag 
W0/eV 2.42 2.3 2.25 3.7 4.8 4.3 
 
Q.1. The total number of isoelectronic species from the given 
set is ___________. 
The number of metals which will show photoelectric effect 
when light of wavelength  400 nm falls on it is ___________ 
A. For 1s orbital, the probability density is maximum at the 
nucleus 
B. For 2s orbital, the probability density first increases to 
maximum and then decreases sharply to zero. 
C. Boundary surface diagrams of the orbitals encloses a region 
of 100% probability of finding the electron. 
D. p and d-orbitals have 1 and 2 angular nodes respectively. 
E. probability density of p-orbital is zero at the nucleus 
 
JEE Main 2023 (Online) 11th April Evening Shift 
 
Q.5.  
 
The electron in the th th th nth  orbit of Li
2
+ is excited 
to (n+1) orbit using the radiation of energy    1.47×10
-17
 J (as 
shown in the diagram). The value of n is ___________ 
 
JEE Main 2023 (Online) 10th April Evening Shift 
 
Q.6. The number of incorrect statement/s about the black body 
from the following is __________ 
(A) Emit or absorb energy in the form of electromagnetic 
radiation. 
JEE Main 2023 (Online) 12th April Morning Shift 
 
Q.4. The number of correct statements from the following is 
___________. 
Page 3


Numerical 
 
 
JEE Main 2023 (Online) 15th April Morning Shift 
 
Q.2. The orbital angular momentum of an electron 
in    3 s orbital is . The value of X is ____________ (nearest 
integer) 
JEE Main 2023 (Online) 13th April Evening Shift 
 
Q.3. Values of work function (W0) for a few metals are given 
below 
Metal Li Na K Mg Cu Ag 
W0/eV 2.42 2.3 2.25 3.7 4.8 4.3 
 
Q.1. The total number of isoelectronic species from the given 
set is ___________. 
The number of metals which will show photoelectric effect 
when light of wavelength  400 nm falls on it is ___________ 
A. For 1s orbital, the probability density is maximum at the 
nucleus 
B. For 2s orbital, the probability density first increases to 
maximum and then decreases sharply to zero. 
C. Boundary surface diagrams of the orbitals encloses a region 
of 100% probability of finding the electron. 
D. p and d-orbitals have 1 and 2 angular nodes respectively. 
E. probability density of p-orbital is zero at the nucleus 
 
JEE Main 2023 (Online) 11th April Evening Shift 
 
Q.5.  
 
The electron in the th th th nth  orbit of Li
2
+ is excited 
to (n+1) orbit using the radiation of energy    1.47×10
-17
 J (as 
shown in the diagram). The value of n is ___________ 
 
JEE Main 2023 (Online) 10th April Evening Shift 
 
Q.6. The number of incorrect statement/s about the black body 
from the following is __________ 
(A) Emit or absorb energy in the form of electromagnetic 
radiation. 
JEE Main 2023 (Online) 12th April Morning Shift 
 
Q.4. The number of correct statements from the following is 
___________. 
(B) Frequency distribution of the emitted radiation depends on 
temperature. 
(C) At a given temperature, intensity vs frequency curve passes 
through a maximum value. 
(D) The maximum of the intensity vs frequency curve is at a 
higher frequency at higher temperature compared to that at 
lower temperature. 
 
JEE Main 2023 (Online) 10th April Morning Shift 
Q.7. The number of atomic orbitals from the following having 5 
radial nodes is ___________. 
 
JEE Main 2023 (Online) 8th April Evening Shift 
 
Q.8. The number of following statement/s which is/are 
incorrect is ___________ 
(A) Line emission spectra are used to study the electronic 
structure 
(B) The emission spectra of atoms in the gas phase show a 
continuous spread of wavelength from red to violet 
(C) An absorption spectrum is like the photographic negative of 
an emission spectrum 
(D) The element helium was discovered in the sun by 
spectroscopic method 
 
JEE Main 2023 (Online) 8th April Morning Shift 
 
Q.9. The wavelength of an electron of kinetic 
energy 4.50×10
-29
 J is _________ ×10
-5
 m. (Nearest integer) 
Page 4


Numerical 
 
 
JEE Main 2023 (Online) 15th April Morning Shift 
 
Q.2. The orbital angular momentum of an electron 
in    3 s orbital is . The value of X is ____________ (nearest 
integer) 
JEE Main 2023 (Online) 13th April Evening Shift 
 
Q.3. Values of work function (W0) for a few metals are given 
below 
Metal Li Na K Mg Cu Ag 
W0/eV 2.42 2.3 2.25 3.7 4.8 4.3 
 
Q.1. The total number of isoelectronic species from the given 
set is ___________. 
The number of metals which will show photoelectric effect 
when light of wavelength  400 nm falls on it is ___________ 
A. For 1s orbital, the probability density is maximum at the 
nucleus 
B. For 2s orbital, the probability density first increases to 
maximum and then decreases sharply to zero. 
C. Boundary surface diagrams of the orbitals encloses a region 
of 100% probability of finding the electron. 
D. p and d-orbitals have 1 and 2 angular nodes respectively. 
E. probability density of p-orbital is zero at the nucleus 
 
JEE Main 2023 (Online) 11th April Evening Shift 
 
Q.5.  
 
The electron in the th th th nth  orbit of Li
2
+ is excited 
to (n+1) orbit using the radiation of energy    1.47×10
-17
 J (as 
shown in the diagram). The value of n is ___________ 
 
JEE Main 2023 (Online) 10th April Evening Shift 
 
Q.6. The number of incorrect statement/s about the black body 
from the following is __________ 
(A) Emit or absorb energy in the form of electromagnetic 
radiation. 
JEE Main 2023 (Online) 12th April Morning Shift 
 
Q.4. The number of correct statements from the following is 
___________. 
(B) Frequency distribution of the emitted radiation depends on 
temperature. 
(C) At a given temperature, intensity vs frequency curve passes 
through a maximum value. 
(D) The maximum of the intensity vs frequency curve is at a 
higher frequency at higher temperature compared to that at 
lower temperature. 
 
JEE Main 2023 (Online) 10th April Morning Shift 
Q.7. The number of atomic orbitals from the following having 5 
radial nodes is ___________. 
 
JEE Main 2023 (Online) 8th April Evening Shift 
 
Q.8. The number of following statement/s which is/are 
incorrect is ___________ 
(A) Line emission spectra are used to study the electronic 
structure 
(B) The emission spectra of atoms in the gas phase show a 
continuous spread of wavelength from red to violet 
(C) An absorption spectrum is like the photographic negative of 
an emission spectrum 
(D) The element helium was discovered in the sun by 
spectroscopic method 
 
JEE Main 2023 (Online) 8th April Morning Shift 
 
Q.9. The wavelength of an electron of kinetic 
energy 4.50×10
-29
 J is _________ ×10
-5
 m. (Nearest integer) 
Given : mass of electron is 9×10
-31
 kg, h =6.6×10
-34
 J s 
 
JEE Main 2023 (Online) 6th April Morning Shift 
 
Q.10. Electrons in a cathode ray tube have been emitted with a 
velocity of 1000 m s-1. The number of following statements 
which is/are true? about the emitted radiation is ____________. 
Given :    h=6×10
-34
 J s,me=9×10
-31
 kg. 
(A) The de-Broglie wavelength of the electron emitted is 666.67 
nm. 
(B) The characteristic of electrons emitted depend upon the 
material of the electrodes of the cathode ray tube. 
(C) The cathode rays start from cathode and move towards 
anode. 
(D) The nature of the emitted electrons depends on the nature 
of the gas present in cathode ray tube. 
 
JEE Main 2023 (Online) 1st February Morning Shift 
 
Q.11. The energy of one mole of photons of radiation of 
frequency   2 ×10
12
 Hz in   J mol
- 1
 is ___________. (Nearest integer) 
 
JEE Main 2023 (Online) 30th January Morning Shift 
 
Q.12. Assume that the radius of the first Bohr orbit of hydrogen 
atom is 0.6 A
o
. The radius of the third Bohr orbit of He + is 
__________ picometer. (Nearest Integer) 
JEE Main 2023 (Online) 29th January Evening Shift 
Page 5


Numerical 
 
 
JEE Main 2023 (Online) 15th April Morning Shift 
 
Q.2. The orbital angular momentum of an electron 
in    3 s orbital is . The value of X is ____________ (nearest 
integer) 
JEE Main 2023 (Online) 13th April Evening Shift 
 
Q.3. Values of work function (W0) for a few metals are given 
below 
Metal Li Na K Mg Cu Ag 
W0/eV 2.42 2.3 2.25 3.7 4.8 4.3 
 
Q.1. The total number of isoelectronic species from the given 
set is ___________. 
The number of metals which will show photoelectric effect 
when light of wavelength  400 nm falls on it is ___________ 
A. For 1s orbital, the probability density is maximum at the 
nucleus 
B. For 2s orbital, the probability density first increases to 
maximum and then decreases sharply to zero. 
C. Boundary surface diagrams of the orbitals encloses a region 
of 100% probability of finding the electron. 
D. p and d-orbitals have 1 and 2 angular nodes respectively. 
E. probability density of p-orbital is zero at the nucleus 
 
JEE Main 2023 (Online) 11th April Evening Shift 
 
Q.5.  
 
The electron in the th th th nth  orbit of Li
2
+ is excited 
to (n+1) orbit using the radiation of energy    1.47×10
-17
 J (as 
shown in the diagram). The value of n is ___________ 
 
JEE Main 2023 (Online) 10th April Evening Shift 
 
Q.6. The number of incorrect statement/s about the black body 
from the following is __________ 
(A) Emit or absorb energy in the form of electromagnetic 
radiation. 
JEE Main 2023 (Online) 12th April Morning Shift 
 
Q.4. The number of correct statements from the following is 
___________. 
(B) Frequency distribution of the emitted radiation depends on 
temperature. 
(C) At a given temperature, intensity vs frequency curve passes 
through a maximum value. 
(D) The maximum of the intensity vs frequency curve is at a 
higher frequency at higher temperature compared to that at 
lower temperature. 
 
JEE Main 2023 (Online) 10th April Morning Shift 
Q.7. The number of atomic orbitals from the following having 5 
radial nodes is ___________. 
 
JEE Main 2023 (Online) 8th April Evening Shift 
 
Q.8. The number of following statement/s which is/are 
incorrect is ___________ 
(A) Line emission spectra are used to study the electronic 
structure 
(B) The emission spectra of atoms in the gas phase show a 
continuous spread of wavelength from red to violet 
(C) An absorption spectrum is like the photographic negative of 
an emission spectrum 
(D) The element helium was discovered in the sun by 
spectroscopic method 
 
JEE Main 2023 (Online) 8th April Morning Shift 
 
Q.9. The wavelength of an electron of kinetic 
energy 4.50×10
-29
 J is _________ ×10
-5
 m. (Nearest integer) 
Given : mass of electron is 9×10
-31
 kg, h =6.6×10
-34
 J s 
 
JEE Main 2023 (Online) 6th April Morning Shift 
 
Q.10. Electrons in a cathode ray tube have been emitted with a 
velocity of 1000 m s-1. The number of following statements 
which is/are true? about the emitted radiation is ____________. 
Given :    h=6×10
-34
 J s,me=9×10
-31
 kg. 
(A) The de-Broglie wavelength of the electron emitted is 666.67 
nm. 
(B) The characteristic of electrons emitted depend upon the 
material of the electrodes of the cathode ray tube. 
(C) The cathode rays start from cathode and move towards 
anode. 
(D) The nature of the emitted electrons depends on the nature 
of the gas present in cathode ray tube. 
 
JEE Main 2023 (Online) 1st February Morning Shift 
 
Q.11. The energy of one mole of photons of radiation of 
frequency   2 ×10
12
 Hz in   J mol
- 1
 is ___________. (Nearest integer) 
 
JEE Main 2023 (Online) 30th January Morning Shift 
 
Q.12. Assume that the radius of the first Bohr orbit of hydrogen 
atom is 0.6 A
o
. The radius of the third Bohr orbit of He + is 
__________ picometer. (Nearest Integer) 
JEE Main 2023 (Online) 29th January Evening Shift 
 
Q.13. The number of given orbitals which have electron density 
along the axis is _________ 
 
JEE Main 2023 (Online) 25th January Evening Shift 
 
Q.14. If wavelength of the first line of the Paschen series of 
hydrogen atom is 720 nm, then the wavelength of the second 
line of this series is _________ nm. (Nearest integer) 
 
JEE Main 2023 (Online) 24th January Morning Shift 
 
 
 
 
 
 
 
Answer key & Explanation 
 
 
1. Ans. Correct answer is 5 
Explanation 
Isoelectronic species are atoms, ions or molecules that have 
the same number of electrons. To find the isoelectronic species 
from the given set, we need to determine the number of 
electrons in each species. 
 
The electron configuration of each species is: