MHT CET PYQs for Structure of Atom with Solutions: Practice MHT CET Previous Year Questions

Structure of Atom is a Class 11 chapter in the Chemistry section of the MHT CET for candidates who are preparing for the PCM (Physics, Chemistry, and Mathematics).

The key topics covered in Structure of Atom PYQs are:

Quantum numbers, orbitals and electronic configuration
Bohr's model and the hydrogen spectrum
Electromagnetic radiation and the photoelectric effect
Heisenberg's uncertainty principle
Isotopes, isobars and average atomic mass

Practising Structure of Atom MHT CET PYQ helps candidates to understand question pattern, improve calculation speed, and identify concepts which were asked in previous exams.

Based on chapter-wise analysis of the MHT CET Chemistry paper, you can get about 1 mark per paper by covering Structure of Atom. The chapter recorded 110 questions across the 80 shifts in the data, and 36 of them came in the 2025 and 2026 papers, where it contributed about 2.2% per shift.

MHT CET Structure of Atom Chapter: Question Count, Marks and Weightage:

1.38 Average questions per shift (2018-2026)	36 Questions in the 2025 and 2026 papers (33 shifts)
110 Questions in the PDF (2020-2026)	2.8% Estimated Chemistry paper weightage (2.2% in 2025-2026)

The PDF holds 110 questions from MHT CET 2026 to 2020, newest first, each with its exam date and shift. Options are as printed and answer keys are not included.

Structure of Atom PYQ Statistics (2022-2026)

The table below shows the number of questions asked in MHT CET Structure of Atom PYQs. Every shift has 50 Chemistry questions, so the last column is the average per shift divided by 50.

Year	Total Questions (across shifts)	Shifts in the Data	Average per Shift	Weightage (out of 50 Chemistry Qs)
2026	16	16	1.00	2.0%
2025	20	17	1.18	2.4%
2024	38	18	2.11	4.2%
2023	24	12	2.00	4.0%
2022	1	1	1.00	2.0%

The 2018 to 2021 papers in the PDF add 11 more questions: 2021 had 10, 2020 had 1, 2019 had none, 2018 had none.

MHT CET Structure of Atom Important Questions: Based on the Last 5 Years

The major types of questions asked from Structure of Atom in MHT CET cover the following topics:

Topic	Questions in the PDF	Questions in 2022-2026	Average per Shift (2022-2026)
Quantum numbers, orbitals and unpaired electrons	29	25	0.39
Radiation, wavelength, wave number and spectral series	33	29	0.45
Bohr's model and stationary orbits	22	21	0.33
Uncertainty principle and electronic configuration	6	6	0.09
Isotopes, isobars and atomic models	20	18	0.28

Pair PYQs with Other Study Material for MHT CET 2027

Click on the link to practise problems and time management skills:

Resource	Link
MHT CET Sample Paper	Check Here
MHT CET Mock Test	Check Here

Question Style in MHT CET Structure of Atom PYQs

Every question in this PDF is a single-correct MCQ. Radiation and spectral series questions are the largest group, followed by quantum numbers and orbitals.

Question Style	What it Tests
Quantum numbers and orbitals	The pair of orbitals with the same (n + l) value, the unpaired electrons in silicon and chromium, and the electrons in the s and p orbitals of argon
Spectral series	The shortest wavelength of the Lyman series in the hydrogen spectrum, and the wave number of the lowest transition of the Paschen series
Bohr's model	The energy of the third stationary orbit when the ground state energy is -E, and the energy of an electron in the n = 2 state
Uncertainty principle	The uncertainty in the velocity of an electron when the uncertainty in position is 50 pm, and the principle that says position and momentum cannot be known together
Isotopes and average atomic mass	The average atomic mass of chlorine from its isotopes Cl-35 and Cl-37 in the ratio 75% : 25%, and which pair represents isobars

How to Use the Structure of Atom PYQ PDF for MHT CET

Start with the 2025 and 2026 papers first, because they hold 36 of the 110 questions.
Learn the Rydberg formula 1/λ = R(1/n₁² - 1/n₂²) and the series limits for Lyman, Balmer and Paschen.
For electron counts and unpaired electrons, write the electronic configuration with the Aufbau, Pauli and Hund rules before answering.
Solve year-wise PYQs by timing yourself, as time management is crucial.
Re-attempt only the questions you got wrong, and note which formula or step you missed.

Video: Structure of Atom PYQs and MCQs

Source: Motion Education Deccan Pune

Structure of Atom PYQ for MHT CET Chemistry FAQs

Ques. How many questions come from Structure of Atom every year?

Ans. In this PDF, the questions are 16 from 2026, 20 from 2025, 38 from 2024, 24 from 2023 and 1 from 2022 and the rest from earlier papers. In 2025 and 2026 together the chapter had 36 questions across 33 shifts, about 1.09 per shift.

Ques. Which topics are asked most frequently in MHT CET Structure of Atom?

Ans. Radiation, wavelength, wave number and spectral series is the largest group with 33 of the 110 questions, about 30%.

Ques. What kind of questions are asked from Structure of Atom?

Ans. Single-correct MCQs, mostly numerical. Common ones ask for the wavelength or wave number of a hydrogen spectral line, the energy of a Bohr orbit, the unpaired electrons in an atom, or the uncertainty in velocity.

Ques. What is the best way to practise Structure of Atom PYQs?

Ans. First solve the 2025 and 2026 questions completely, then the older ones, and finally re-attempt the questions you got wrong.

Ques. Can I score full marks from Structure of Atom?

Ans. In 2025 and 2026 together the chapter had 36 questions across 33 shifts. Learning the Rydberg formula, the Bohr formulas and the electronic configuration rules is enough to secure it. Each Chemistry question in MHT CET is worth 1 mark.

Ques. Does the Structure of Atom PYQ PDF include solutions?

Ans. No. The PDF contains the questions with their exam date and shift, without answer keys or solutions.

List I Element	List II Number of Neutron
(A). \(_{12}^{24}Mg\)	(I). \(5\)
(B). \(_{13}^{27}Al\)	(II). \(12\)
(C). \(_4^9Be\)	(III). \(6\)
(D). \(_6^{12}C\)	(IV). \(14\)

MHT CET PYQs for Structure of Atom with Solutions: Practice MHT CET Previous Year Questions

Structure of Atom PYQ Statistics (2022-2026)

MHT CET Structure of Atom Important Questions: Based on the Last 5 Years

Pair PYQs with Other Study Material for MHT CET 2027

Question Style in MHT CET Structure of Atom PYQs

How to Use the Structure of Atom PYQ PDF for MHT CET

Video: Structure of Atom PYQs and MCQs

Structure of Atom PYQ for MHT CET Chemistry FAQs

1.
How many mole of electrons are required for the reduction of 1 mole of Cr³⁺ to Cr_(s)?

2.
An ionic compound has a unit cell consisting of A ions at the corners of a cube and B ions on the centres of the faces of the cube. The empirical formula for this compound would be:

3.
The enthalpy and entropy change for the reaction: ${Br}_{2} (l) + {Cl}_{2} (g) \to 2 BrCl (g)$ are $30 kJ {mol}^{- 1}$ and $105 {JK}^{- 1} {mol}^{- 1}$ respectively.The temperature at which the reaction will be in equilibrium is:

4.
When $10 m l$ of $0.2 M$ solution of an acid is added to $250 m l$ of a buffer solution with $p H = 6.34$ , the $p H$ of the solution becomes $6.32$ . The buffer capacity of the solution is:

5.
The unit of atomic mass, amu is replaced by u, here u stands for:

6.
In ___________, a reaction product is itself a catalyst for that reaction leading to positive feedback.

7.
Which is an oxidizing agent in following reaction?
Fe_(s) + Cu²⁺_(aq) \(\to\) Fe²⁺_(aq) + Cu_(s)

8.
Carbon belongs to the second period and Group 14. Silicon belongs to the third period and Group 14. If atomic number of carbon is 6, the atomic number of silicon is:

9.
What are the total number of electrons present in s and p orbitals respectively in the argon?

10.
What is the wavenumber of the photon emitted during transition from the orbit $\text{n} = 5$ to that of $\text{n} = 2$ in hydrogen atom? $[ \text{R}_\text{H} = 109677\text{ cm}^{-1} ]$}

11.
What is the wavenumber of the photon emitted during transition from the orbit $\text{n} = 5$ to that of $\text{n} = 2$ in hydrogen atom? $[ \text{R}_\text{H} = 109677\text{ cm}^{-1} ]$}

12.
Match List I with List II
List I
Element List II
Number of Neutron
(A). \(_{12}^{24}Mg\) (I). \(5\)
(B). \(_{13}^{27}Al\) (II). \(12\)
(C). \(_4^9Be\) (III). \(6\)
(D). \(_6^{12}C\) (IV). \(14\)
Choose the correct answer from the options given below:

13.
Plastic used to preserve yogurts is replaced with a polymer called polylactic acid is an example of ____________.

14.
Calculate the wave number of photon emitted during the transition from the orbit n=2 to n = 1 in hydrogen atom (R_H = 109677 cm^–1)

15.
Heavy water is _________.

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Structure of Atom PYQ Statistics (2022-2026)

MHT CET Structure of Atom Important Questions: Based on the Last 5 Years

Pair PYQs with Other Study Material for MHT CET 2027

Question Style in MHT CET Structure of Atom PYQs

How to Use the Structure of Atom PYQ PDF for MHT CET

Video: Structure of Atom PYQs and MCQs

Structure of Atom PYQ for MHT CET Chemistry FAQs

1.How many mole of electrons are required for the reduction of 1 mole of Cr3+ to Cr(s)?

2.An ionic compound has a unit cell consisting of A ions at the corners of a cube and B ions on the centres of the faces of the cube. The empirical formula for this compound would be:

3.The enthalpy and entropy change for the reaction:Br2(l)+Cl2( g)→2BrCl(g) are 30kJmol−1 and 105JK−1mol−1 respectively.The temperature at which the reaction will be in equilibrium is:

4.When 10ml of 0.2M solution of an acid is added to 250ml of a buffer solution with pH=6.34, the pH of the solution becomes 6.32. The buffer capacity of the solution is:

5.The unit of atomic mass, amu is replaced by u, here u stands for:

6.In ___________, a reaction product is itself a catalyst for that reaction leading to positive feedback.

7.Which is an oxidizing agent in following reaction? Fe(s) + Cu2+(aq) \(\to\) Fe2+(aq) + Cu(s)

8.Carbon belongs to the second period and Group 14. Silicon belongs to the third period and Group 14. If atomic number of carbon is 6, the atomic number of silicon is:

9.What are the total number of electrons present in s and p orbitals respectively in the argon?

10.What is the wavenumber of the photon emitted during transition from the orbit $\text{n} = 5$ to that of $\text{n} = 2$ in hydrogen atom? $[ \text{R}_\text{H} = 109677\text{ cm}^{-1} ]$}

11.What is the wavenumber of the photon emitted during transition from the orbit $\text{n} = 5$ to that of $\text{n} = 2$ in hydrogen atom? $[ \text{R}_\text{H} = 109677\text{ cm}^{-1} ]$}

12.Match List I with List IIList IElementList IINumber of Neutron(A). \(_{12}^{24}Mg\)(I). \(5\)(B). \(_{13}^{27}Al\)(II). \(12\)(C). \(_4^9Be\)(III). \(6\)(D). \(_6^{12}C\)(IV). \(14\)Choose the correct answer from the options given below:

13.Plastic used to preserve yogurts is replaced with a polymer called polylactic acid is an example of ____________.

14.Calculate the wave number of photon emitted during the transition from the orbit n=2 to n = 1 in hydrogen atom (RH = 109677 cm–1)

15.Heavy water is _________.

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1.
How many mole of electrons are required for the reduction of 1 mole of Cr³⁺ to Cr_(s)?

2.
An ionic compound has a unit cell consisting of A ions at the corners of a cube and B ions on the centres of the faces of the cube. The empirical formula for this compound would be:

3.
The enthalpy and entropy change for the reaction: ${Br}_{2} (l) + {Cl}_{2} (g) \to 2 BrCl (g)$ are $30 kJ {mol}^{- 1}$ and $105 {JK}^{- 1} {mol}^{- 1}$ respectively.The temperature at which the reaction will be in equilibrium is:

4.
When $10 m l$ of $0.2 M$ solution of an acid is added to $250 m l$ of a buffer solution with $p H = 6.34$ , the $p H$ of the solution becomes $6.32$ . The buffer capacity of the solution is:

5.
The unit of atomic mass, amu is replaced by u, here u stands for:

6.
In ___________, a reaction product is itself a catalyst for that reaction leading to positive feedback.

7.
Which is an oxidizing agent in following reaction?
Fe_(s) + Cu²⁺_(aq) \(\to\) Fe²⁺_(aq) + Cu_(s)

8.
Carbon belongs to the second period and Group 14. Silicon belongs to the third period and Group 14. If atomic number of carbon is 6, the atomic number of silicon is:

9.
What are the total number of electrons present in s and p orbitals respectively in the argon?

10.
What is the wavenumber of the photon emitted during transition from the orbit $\text{n} = 5$ to that of $\text{n} = 2$ in hydrogen atom? $[ \text{R}_\text{H} = 109677\text{ cm}^{-1} ]$}

11.
What is the wavenumber of the photon emitted during transition from the orbit $\text{n} = 5$ to that of $\text{n} = 2$ in hydrogen atom? $[ \text{R}_\text{H} = 109677\text{ cm}^{-1} ]$}

12.
Match List I with List II
List I
Element List II
Number of Neutron
(A). \(_{12}^{24}Mg\) (I). \(5\)
(B). \(_{13}^{27}Al\) (II). \(12\)
(C). \(_4^9Be\) (III). \(6\)
(D). \(_6^{12}C\) (IV). \(14\)
Choose the correct answer from the options given below:

13.
Plastic used to preserve yogurts is replaced with a polymer called polylactic acid is an example of ____________.

14.
Calculate the wave number of photon emitted during the transition from the orbit n=2 to n = 1 in hydrogen atom (R_H = 109677 cm^–1)

15.
Heavy water is _________.