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Structure of Atom

JEE Main 2025 (Online) 23rd January Evening ShiftMCQMedium📈 Topic in 3% papers+4−1
Ques. 1JEE 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

Answer

(4) Both Statement I and Statement II are false

Solution

Moseley's law: =a(Z-b) — linear in Z, not in atomic mass; vs Z is a parabola

[figure]

∴ both statements false

Answer: (4)

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Ques. 2JEE 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. 3JEE 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. 4JEE 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 .

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