Chemistry · Structure of Atom
JEE Main 2025 — 3 April, Morning Shift — Question 5
Which of the following postulate of Bohr's model of hydrogen atom is not in agreement with quantum mechanical model of an atom?
- Option A:Correct
The electron in a H-atom's stationary state moves in a circle around the nucleus.
- Option B:
An atom in a stationary state does not emit electromagnetic radiation as long as it stays in the same state.
- Option C:
When an electron makes a transition from a higher energy stationary state to a lower energy stationary state, then it emits a photon of light.
- Option D:
An atom can take only certain distinct energies , etc. These allowed states of constant energy are called the stationary states of atom.
Answer: A
Step-by-step solution
In quantum mechanics electrons do not move in definite circular paths.
They are described by wave functions and probability clouds.
However, discrete energy levels and photon emission during transitions are fully consistent with quantum theory.
Thus only the circular orbit postulate contradicts the quantum mechanical model.
Thus, the correct answer is A.
Answer key and solution verified before publishing.
Practise Structure of Atom
Start with this question, then two more from the same chapter — with a tutor that explains every step. Free.
- Exam
- JEE Main 2025
- Subject
- Chemistry
- Chapter
- Structure of Atom
- Topic
- Bohr's Model of Atom