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Structure of Atom

JEE Main 2025 (Online) 23rd January Morning ShiftMCQMedium📈 Topic in 19% papers+4−1
Ques. 1JEE Main 2025, 23 January (Morning Shift)

Heat treatment of muscular pain involves radiation of wavelength of about 900 nm. Which spectral line of H atom is suitable for this? Given : Rydberg constant RH = 105 cm-1, h = 6.6 10-34 J s, c = 3 108 m/s

  1. Lyman series, 1
  2. Balmer series, 2
  3. Paschen series, 5 3
  4. Paschen series, 3

Answer

(4) Paschen series, 3

Solution

Concept: 1 = RH ( 1n12 - 1n22 ), = 9 10-5 cm

1 RH = 19 10-5 105 = 19 ⇒ n1 = 3, n2 =

∴ Paschen series, 3

Answer: (4)

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Ques. 2JEE Main 2025, 23 January (Evening Shift)

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below :

  1. Both Statement I and Statement II are true
  2. Both Statement I and Statement II are false
  3. Statement I is false but Statement II is true
  4. Statement I is true but Statement II is false
Ques. 3JEE Main 2025, 23 January (Evening Shift)

Given below are two statements about X-ray spectra of elements : In the light of the above statements, choose the correct answer from the options given below :

  1. Statement I is false but Statement II is true
  2. Both Statement I and Statement II are true
  3. Statement I is true but Statement II is false
  4. Both Statement I and Statement II are false
Ques. 4JEE Main 2025, 22 January (Morning Shift)

Radius of the first excited state of Helium ion is given as : a0 radius of first stationary state of hydrogen atom.

  1. r = a04
  2. r = 2a0
  3. r = 4a0
  4. r = a02
Ques. 5JEE Main 2025, 22 January (Evening Shift)

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below :

  1. Statement I is false but Statement II is true
  2. Both Statement I and Statement II are false
  3. Statement I is true but Statement II is false
  4. Both Statement I and Statement II are true
Ques. 6JEE Main 2025, 22 January (Evening Shift)

Niobium (Nb) and ruthenium (Ru) have “x” and “y” number of electrons in their respective 4 d orbitals. The value of x+y is .

Ques. 7JEE Main 2024, 9 April (Morning Shift)

Compare the energies of following sets of quantum numbers for multielectron system. (A) n = 4, l = 1 (B) n = 4, l = 2 (C) n = 3, l = 1 (D) n = 3, l = 2 (E) n = 4, l = 0 Choose the correct answer from the options given below :

  1. (E) > (C) > (A) > (D) > (B)
  2. (B) > (A) > (C) > (E) > (D)
  3. (C) < (E) < (D) < (A) < (B)
  4. (E) < (C) < (D) < (A) < (B)
Ques. 8JEE Main 2024, 9 April (Evening Shift)

Match List I with List II Choose the correct answer from the options given below:

  1. A-IV, B-III, C-II, D-I
  2. A-I, B-IV, C-III, D-II
  3. A-III, B-II, C-I, D-IV
  4. A-II, B-I, C-IV, D-III
Ques. 9JEE Main 2024, 9 April (Evening Shift)

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 m is 109 ms-1 (nearest integer) [Given : mass of electron = 9.1 10-31 kg, Planck's constant (h) = 6.626 10-34 Js] (Value of = 3.14)

Ques. 10JEE Main 2024, 8 April (Morning Shift)

A hypothetical electromagnetic wave is shown below. [figure] The frequency of the wave is x 1019 Hz. x = (nearest integer)

Ques. 11JEE Main 2024, 8 April (Evening Shift)

Wavenumber for a radiation having 5800 Å wavelength is x 10 cm-1. The value of x is . (Integer answer)

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