The JEE Main Chemistry section requires speed and accuracy, along with a thorough understanding of the Atomic Models. This article provides a set of JEE Main PYQs on Atomic Models to help you understand the topic and improve your problem-solving skills with the help of detailed solutions by ensuring conceptual clarity, which will help you in the JEE Main 2026 preparation.
Whether you're revising the basics or testing your knowledge, these JEE Main PYQs will serve as a valuable practice resource.
The JEE Main 2026 exam is likely to continue on the same pattern as JEE Main 2025. Out of 90 questions, students can expect a fair mix from all three subjects. To get an edge, going through JEE Main previous year questions (PYQs) is one of the best strategies.
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JEE Main PYQs on Atomic Models
1.
One mole of an ideal gas expands from 10 dm\(^3\) to 20 dm\(^3\) through an isothermal reversible process. Find \( \Delta U \), \( q \), and \( w \).- \( \Delta U = 0, q = 0, w = 0 \)
- \( \Delta U = 0, q \neq 0, w \neq 0 \)
- \( \Delta U \neq 0, q = 0, w \neq 0 \)
- \( \Delta U \neq 0, q \neq 0, w = 0 \)
2.
Considering Bohr’s atomic model for hydrogen atom :
(A) the energy of H atom in ground state is same as energy of He+ ion in its first excited state.
(B) the energy of H atom in ground state is same as that for Li++ ion in its second excited state.
(C) the energy of H atom in its ground state is same as that of He+ ion for its ground state.
(D) the energy of He+ ion in its first excited state is same as that for Li++ ion in its ground state.- (B), (C) only
- (A), (B) only
- (A), (D) only
- (A), (C) only
3.
Identify the correct statements about alkali metals
A. The order of standard reduction potential \(\left( M ^{+} \mid M \right)\)for alkali metal ions is \(Na > Rb > Li\)
B. \(CsI\)is highly soluble in water.
C. Lithium carbonate is highly stable to heat.
D. Potassium dissolved in concentrated liquid ammonia is blue in colour and paramagnetic.
E. All the alkali metal hydrides are ionic solids.
Choose the correct answer from the options given below:- C and E only
- A and E only
- A, B, D only
- A, B and E only
4.
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : The ionic radii of \(O^{2–}\) and \(Mg^{2+}\) are same.
Reason (R) : Both \(O^{2–}\) and \(Mg^{2+}\) are isoelectronic species.
In the light of the above statements, choose the correct answer from the options given below.- Both (A) and (R) are true and (R) is the correct explanation of (A).
- Both (A) and (R) are true but (R) is not the correct explanation of (A).
- (A) is true but (R) is false.
- (A) is false but (R) is true.
5.
Choose the correct answer :
1. Production of iron in blast furnace follows the following equation
Fe3O4(s)+4CO(g)→3Fe(I)+4CO22(g)
when 4.640 kg of Fe3O4 and 2.520 kg of CO are allowed to react then the amount of iron (in g) produced is
[Given : Molar Atomic mass (g mol–1) : Fe = 56
Molar Atomic mass (g mol–1) : O = 16
Molar Atomic mass (g mol–1) : C = 12]
- 1400
- 2200
- 3360
- 4200
6.
The number of s-electrons present in an ion with 55 protons in its unipositive state is
- 8
- 12
- 9
- 10
7.
Which of the following statements are correct?- The electronic configuration of Cr is [Ar] 3d54s1.
- The magnetic quantum number may have a negative value.
- In the ground state of an atom, the orbitals are filled in order of their increasing energies.
- The total number of nodes are given by n – 2.
- (A), (C) and (D) only
- (A) and (B) only
- (A) and (C) only
- (A), (B) and (C) only
8.
Magnetic moment due to the motion of the electron in nth orbit of Bohr atom is proportional to nx. The value of x is- 0
- 1
- 2
- 3
9.
Choose the Incorrect Statement about Dalton's Atomic Theory- Compounds are formed when atoms of different elements combine in any ratio
- All the atoms of a given element have identical properties including identical mass
- Matter consists of indivisible atoms
- Chemical reactions involve recorganization of atoms
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