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Structure of Atom

JEE Main 2025 (Online) 2nd April Morning ShiftMCQEasy📈 Topic in 26% papers+4−1
Ques. 1JEE Main 2025, 2 April (Morning Shift)

According to Bohr's model of hydrogen atom, which of the following statement is incorrect?

  1. Radius of 4th orbit is four times larger than that of 2nd orbit
  2. Radius of 8th orbit is four times larger than that of 4th orbit
  3. Radius of 6th orbit is three times larger than that of 4th orbit
  4. Radius of 3rd orbit is nine times larger than that of 1st orbit

Answer

(3) Radius of 6th orbit is three times larger than that of 4th orbit

Solution

For hydrogen, rn = 0.529 n2 Å rn n2

(1) r4r2 = 164 = 4 correct

(2) r8r4 = 6416 = 4 correct

(3) r6r4 = 3616 = 2.25, not 3 incorrect

(4) r3r1 = 91 = 9 correct

Answer: (3)

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Ques. 2JEE Main 2025, 2 April (Evening Shift)

Which of the following statements are true? Choose the correct answer from the options given below:

  1. (A) and (B) only
  2. (B) and (D) only
  3. (C) and (D) only
  4. (A), (B) and (C) only
Ques. 3JEE Main 2025, 29 January (Morning Shift)

If a0 is denoted as the Bohr radius of hydrogen atom, then what is the de Broglie wavelength (λ) of the electron present in the second orbit of hydrogen atom? [n : any integer]

  1. 8 a0n
  2. 2a0n
  3. na04
  4. 4 a0n
Ques. 4JEE Main 2025, 28 January (Morning Shift)

In a multielectron atom, which of the following orbitals described by three quantum numbers will have same energy in absence of electric and magnetic fields? Choose the correct answer from the options given below:

  1. B and C Only
  2. C and D Only
  3. A and B Only
  4. D and E Only
Ques. 5JEE Main 2025, 28 January (Evening Shift)

Which of the following is/are not correct with respect to energy of atomic orbitals of hydrogen atom? Choose the correct answer from the options given below :

  1. (A) and (B) only
  2. (A) and (C) only
  3. (B) and (D) only
  4. (C) and (D) only

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