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Previous year question hub

Atomic Structure - Physical Chemistry - Chemistry Previous Year Questions

Practice Atomic Structure - Physical Chemistry - Chemistry previous year questions organised from real papers, with year-wise coverage and clear topic navigation.

11Papers
6Years
25Questions
1Topics

Atomic Structure question pattern

Every graph below is calculated only from this selection.

Questions by year

Year-wise coverage for Atomic Structure. Each bar uses a separate theme-derived color.

Difficulty distribution

How the classified questions are distributed by difficulty.

Not classified 25 100%

Question type distribution

MCQ, numerical, multiple-select and other formats found in these papers.

Multiple Choices 25 100%

Subject weightage

Top subjects by unique question coverage.

Chemistry
25 Qs

Most asked topics

Top topics across the included previous year papers.

Physical Chemistry
25 Qs

Subtopic coverage

Top subtopics inside this exact selection.

Atomic Structure
25 Qs

Paper coverage

Question coverage for the most populated papers. Every active PYP paper remains listed below.

COMEDK 2025 EVENING SHIFT
2 Qs
COMEDK 2025 Morning Shift
2 Qs
COMEDK 2025 AFTERNOON SHIFT
1 Qs
COMEDK 2024 MORNING SHIFT
3 Qs
COMEDK 2024 AFTERNOON SHIFT
2 Qs
COMEDK 2024 EVENING SHIFT
2 Qs
COMEDK 2023 EVENING SHIFT
2 Qs
COMEDK 2023 Morning Shift
2 Qs
COMEDK 2022
4 Qs
COMEDK 2021
3 Qs
COMEDK 2020
2 Qs

Included previous year papers

Newest papers appear first. Sort by year, question coverage or name.

PaperYear / sessionQuestions in this viewOpen
COMEDK 2025 AFTERNOON SHIFT20251View paper
COMEDK 2025 EVENING SHIFT20252View paper
COMEDK 2025 Morning Shift20252View paper
COMEDK 2024 AFTERNOON SHIFT20242View paper
COMEDK 2024 EVENING SHIFT20242View paper
COMEDK 2024 MORNING SHIFT20243View paper
COMEDK 2023 EVENING SHIFT20232View paper
COMEDK 2023 Morning Shift20232View paper
COMEDK 202220224View paper
COMEDK 202120213View paper
COMEDK 202020202View paper

All Atomic Structure previous year questions

Practice every matching question in batches of 20, with every available option.

1
2020 · Chemistry · Physical Chemistry · Atomic Structure
COMEDK 2020

Mg\(^{2+}\) is isoelectronic with

A
Ca\(^{2+}\)
B
Na\(^{+}\)
C
Zn\(^{2+}\)
D
Cu\(^{2+}\)
Open complete paper
2
2020 · Chemistry · Physical Chemistry · Atomic Structure
COMEDK 2020

A body of mass 10 mg is moving with a velocity of 100 ms\(^{-1}\). The wavelength of de-Broglie wave associated with it would be

(\(h=6.63\times10^{-34}\) Js)

A
\(6.63\times10^{-37}\) m
B
\(6.63\times10^{-31}\) m
C
\(6.63\times10^{-34}\) m
D
\(6.63\times10^{-35}\) m
Open complete paper
3
2021 · Chemistry · Physical Chemistry · Atomic Structure
COMEDK 2021

The total number of nodes are given by

A
\((n + 1)\)
B
\((n -l- 1)\)
C
\((n - 1)\)
D
\((n -l+ 1)\)
Open complete paper
4
2021 · Chemistry · Physical Chemistry · Atomic Structure
COMEDK 2021

Which of the following series of transitions in the spectrum of hydrogen atom fall in visible region?

A
Balmer series
B
Paschen series
C
Brackett series
D
Lyman series
Open complete paper
5
2021 · Chemistry · Physical Chemistry · Atomic Structure
COMEDK 2021

The Lyman series of hydrogen spectrum lies in which region

A
Infrared region
B
Visible region
C
Ultraviolet region
D
X-ray region
Open complete paper
6
2022 · Chemistry · Physical Chemistry · Atomic Structure
COMEDK 2022

Minimum number of nodes are present in

A
2s
B
3s
C
4s
D
5s
Open complete paper
7
2022 · Chemistry · Physical Chemistry · Atomic Structure
COMEDK 2022

The spectrum of He\(^+\) is similar to

A
H
B
Li\(^+\)
C
Na
D
He\(^+\)
Open complete paper
8
2022 · Chemistry · Physical Chemistry · Atomic Structure
COMEDK 2022

\(\mathrm{O^{2-},F^-,Mg^{2+},Al^{3+},O_2,F_2}\). How many of the species given above isoelectronic?

A
4
B
2
C
3
D
5
Open complete paper
9
2022 · Chemistry · Physical Chemistry · Atomic Structure
COMEDK 2022

The Paschen series of hydrogen spectrum lies in which region?

A
UV region
B
IR region
C
Visible region
D
Microwave region
Open complete paper
10
2023 · Chemistry · Physical Chemistry · Atomic Structure
COMEDK 2023 EVENING SHIFT

A proton having mass equal to \(1.66 \times 10^{-27} \mathrm{~kg}\) is accelerated to one tenth of the velocity of light. If its velocity can be measured to an accuracy of \(\pm 2 \%\), what would be the uncertainty in its position?

A
\(7.9 \times 10^{-5} \mathrm{~m}\)
B
\(5.29 \times 10^{-14} \mathrm{~m}\)
C
\(6.0 \times 10^{-5} \mathrm{~m}\)
D
\(1.06 \times 10^{-13} \mathrm{~m}\)
Open complete paper
11
2023 · Chemistry · Physical Chemistry · Atomic Structure
COMEDK 2023 EVENING SHIFT

The energy of an electron in the ground state of Hydrogen atom is \(-2.18 \times 10^{-18} \mathrm{~J}\). What would be the energy associated with the second excited state of \(\mathrm{Li}\) ?

A
\(-2.18 \times 10^{-18} \mathrm{~J}\)
B
\(-4.905 \times 10^{-18} \mathrm{~J}\)
C
\(-0.242 \times 10^{-18} \mathrm{~J}\)
D
\(-3.26 \times 10^{-18} \mathrm{~J}\)
Open complete paper
12
2024 · Chemistry · Physical Chemistry · Atomic Structure
COMEDK 2024 AFTERNOON SHIFT

The correct sequence of filling of electrons in \(n=6\) is:

A
\(n s \rightarrow(n-1) d \rightarrow(n-2) f \rightarrow n p\)
B
\(n s \rightarrow n p \rightarrow(n-1) d \rightarrow(n-2) f\)
C
\(n s \rightarrow(n-2) f \rightarrow n p \rightarrow(n-1) d\)
D
\(n s \rightarrow(n-2) f \rightarrow(n-1) d \rightarrow n p\)
Open complete paper
13
2024 · Chemistry · Physical Chemistry · Atomic Structure
COMEDK 2024 AFTERNOON SHIFT

The ratio of the first three radii of Bohr's atom is:

A
\(1: 4: 9\)
B
\(1: 5: 9\)
C
\(1:4:27\)
D
\(1: 2: 3\)
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14
2024 · Chemistry · Physical Chemistry · Atomic Structure
COMEDK 2024 EVENING SHIFT

What is the wave number (Units \(\mathrm{cm}^{-1}\)) of the longest wave length transition in the Balmer series of Hydrogen spectrum? \(Z=1 \text { for } H\)

A
27419.6
B
15233
C
39605.6
D
1354
Open complete paper
15
2024 · Chemistry · Physical Chemistry · Atomic Structure
COMEDK 2024 EVENING SHIFT
What are the Principal & Azimuthal quantum number values of the valence electrons in tripositive Lutetium?
A
\(\mathrm{n}=4 \quad \& \quad 1=2\)
B
\(\mathrm{n}=5 \quad \& \quad 1=2\)
C
\(\mathrm{n}=5 \quad \& \quad 1=3\)
D
\(n=4 \quad \& \quad 1=3\)
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16
2024 · Chemistry · Physical Chemistry · Atomic Structure
COMEDK 2024 MORNING SHIFT

A statement of Assertion followed by a statement of Reason is given. Choose the correct answer out of the following options.

Assertion : Energy of \(2 \mathrm{~s}\) orbital of Hydrogen is less than the energy of the \(2 \mathrm{~s}\) orbital of Lithium.

Reason : Energies of orbitals in the same subshell decrease with increase in atomic number.

A
Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
B
Assertion is correct but Reason is incorrect statement.
C
Assertion is incorrect but Reason is correct statement.
D
Both Assertion and Reason are incorrect statements.
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17
2024 · Chemistry · Physical Chemistry · Atomic Structure
COMEDK 2024 MORNING SHIFT

Given below are 4 subatomic particles travelling with the same velocity "v". Which of them will have the shortest wavelength?

$$[A]=\text { Proton }[B]=\text { Neutron. }[C]=\text { Alpha particle. }[D]=\text { Electron. }$$

A
[B]
B
[D]
C
[C]
D
[A]
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18
2024 · Chemistry · Physical Chemistry · Atomic Structure
COMEDK 2024 MORNING SHIFT

The mass number of an element \(\mathrm{X}\) is 175 with 104 neutrons in its nucleus. Into which one of the following orbitals will the last electron enter?

A
5f
B
6s
C
5d
D
4f
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19
2025 · Chemistry · Physical Chemistry · Atomic Structure
COMEDK 2025 AFTERNOON SHIFT
Two subatomic particles 1 and 2, with the same kinetic energies have their de- Broglie wavelengths as $\lambda_1 \& \lambda_2$ and masses as 3 m and 6 m respectively. Determine the ratio $\lambda_1: \lambda_2$.
A
$2: 1$
B
$1: 2$
C
$\sqrt{2}: 1$
D
$1: \sqrt{2}$
Open complete paper
20
2025 · Chemistry · Physical Chemistry · Atomic Structure
COMEDK 2025 EVENING SHIFT
The number of electrons with azimuthal quantum numbers $l=1$ and $l=2$ for Cr in the ground state electronic configurations are respectively. [Given: $\mathrm{Cr}(\mathrm{Z}=24)$ ]
A
5 and 16
B
12 and 5
C
12 and 8
D
12 and 16
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Showing 20 of 25 questions