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Structure of Atom

JEE Mains Chemistry. Try each one first, then open its answer.

Top 10 JEE Mains PYQs to practise first

The questions and kinds of question asked most often come first. Each one says how often and in which papers.

  1. Question 1

    This type asked 8 times: 24 Jan 2023, 29 Jan 2023, 31 Jan 2023, 21 Jan 2026 S2, 22 Jan 2026 S2, 24 Jan 2026 S1, 4 Apr 2026 S1, 6 Apr 2026 S1. This one: 6 Apr 2026 S1 See all 8 of this type

    27
    If shortest wavelength of hydrogen atom in Lyman series is x , then longest wavelength in Balmer series of He+He^{+}is :

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  2. Question 2

    This type asked 7 times: 26 Jun 2022, 25 Jan 2023, 29 Jan 2023, 22 Jan 2025, 2 Apr 2025, 4 Apr 2026 S2, 6 Apr 2026 S2. This one: 6 Apr 2026 S2 See all 7 of this type

    27
    The Bohr radius of a hydrogen like species is 70.53 pm . The species and the stationary state(n) are respectively (Given: Hydrogen atom Bohr radius is 52.9 pm )

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  3. Question 3

    This type asked 6 times: 2021 Paper 9, 2021 Paper 25, 26 Jun 2022, 8 Apr 2023, 1 Feb 2024, 6 Apr 2026 S1. This one: 6 Apr 2026 S1 See all 6 of this type

    28
    Match List-I with List-II :
    List-I (Orbital)List-II (Radial nodes and nodal plane)
    (A)2s(I)1 Radial node + two nodal planes
    (B)3s(II)1 Radial node + one nodal plane
    (C)3p(III)2 Radial nodes + No nodal plane
    (D)4d(IV)1 Radial node + No nodal plane.
    Choose the correct answer from the options given below:

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  4. Question 4

    This type asked 6 times: 2021 Paper 11, 10 Apr 2023, 13 Apr 2023, 22 Jan 2026 S1, 23 Jan 2026 S1, 2 Apr 2026 S1. This one: 2 Apr 2026 S1 See all 6 of this type

    27
    What is the energy (in J atom−1\mathrm{J\ atom^{-1}}) required for the following process? Li2+(g)→Li3+(g)+e−Li^{2 +}(g) \rightarrow Li^{3 +}(g) +e^{-} (Take the ionization energy for the H atom in the ground state as 2.18×10−18 J atom−12.18 \times10^{- 18}\ \mathrm{J\ atom^{-1}})

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  5. Question 5

    This type asked 5 times: 27 Jul 2022, 29 Jul 2022, 31 Jan 2023, 9 Apr 2024, 5 Apr 2026 S1. This one: 5 Apr 2026 S1 See all 5 of this type

    27
    Arrange the following atomic orbitals of multi electron atoms in order of increasing energy. (A) n=3,l=2, m=+1n = 3,\mathcal{l} = 2,\text{ }m = + 1 (B) n=4,l=0,m=0n = 4,\mathcal{l} = 0,m = 0 (C) n=6,l=1, m=0n = 6,\mathcal{l} = 1,\text{ }m = 0 (D) n=5,l=1, m=+1n = 5,\mathcal{l} = 1,\text{ }m = + 1 (E) n=2,l=1, m=+1n = 2,\mathcal{l} = 1,\text{ }m = + 1 Choose the correct answer from the options given below :

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  6. Question 6

    This type asked 5 times: 2021 Paper 11, 2021 Paper 23, 29 Jan 2024, 31 Jan 2024, 4 Apr 2026 S1. This one: 4 Apr 2026 S1 See all 5 of this type

    28
    Which of the following is correct set of 4 quantum number of 19th19^{\text{th}} electron in Chromium (Atomic number =24= 24 ) in accordance with Aufbau principle?

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  7. Question 7

    This type asked 5 times: 30 Jan 2023, 27 Jan 2024, 4 Apr 2024, 5 Apr 2024, 23 Jan 2026 S1. This one: 23 Jan 2026 S1 See all 5 of this type

    36
    Given, (A) n=5,ml=−1n = 5,m_{l}= - 1 (B) n=3,l=2,ml=−1,ms=+12n = 3,l = 2,m_{l}= - 1,m_{s}= +\frac{1}{2} The maximum number of electron(s) in an atom that can have the quantum numbers as given in (A) and (B) respectively are :

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  8. Question 8

    This type asked 4 times: 2021 Paper 26, 27 Jun 2022, 29 Jul 2022, 9 Apr 2024. This one: 9 Apr 2024 See all 4 of this type

    147
    Based on Heisenberg's uncertainty principle, the uncertainty in the velocity of the electron to be found within an atomic nucleus of diameter 10−15 m10^{- 15}\text{ }m is _____ ×109 ms−1\times10^{9}{\text{ }ms}^{- 1} (nearest integer) [Given: mass of electron =9.1×10−31 kg= 9.1 \times10^{- 31}\text{ }kg, Plank's constant (h)=6.626×10−34Js(h) = 6.626 \times10^{- 34}Js ] (Value of π=3.14\pi = 3.14 )

  9. Question 9

    This type asked 3 times: 8 Apr 2024, 28 Jan 2026 S2, 8 Apr 2026 S2. This one: 8 Apr 2026 S2 See all 3 of this type

    48
    Consider two radiations of wavelengths : 1. λ1=2000Å\lambda_{1} = 2000\text{Å} 2. λ2=6000Å\lambda_{2} = 6000\text{Å} The ratio of the energies of these two radiations (E1E2)\left( \frac{E_{1}}{E_{2}} \right) is ____\_\_\_\_ . (Nearest integer)

  10. Question 10

    This type asked 3 times: 2021 Paper 19, 23 Jan 2026 S2, 2 Apr 2026 S2. This one: 2 Apr 2026 S2 See all 3 of this type

    46
    The surface of sodium metal is irradiated with radiation of wavelength x nm . The kinetic energy of ejected electrons is 2.8×10−20 J2.8 \times 10^{- 20}\text{ }J. The work function of sodium is 2.3 eV . The value of x is ____\_\_\_\_ ×102 nm\times 10^{2}\text{ }nm. (Nearest integer) (Given : h=6.6×10−34 J s;1eV=1.60×10−19 Jh = 6.6 \times 10^{- 34}\text{ }J\text{ }s;1eV = 1.60 \times 10^{- 19}\text{ }J; c=3.0×108 ms−1c = 3.0 \times 10^{8}{\text{ }ms}^{- 1} )