JEE MAIN - Chemistry (2025 - 3rd April Morning Shift - No. 5)
Which of the following postulate of Bohr's model of hydrogen atom is not in agreement with quantum mechanical model of an atom?
The electron in a H atom's stationary state moves in a circle around the nucleus.
An atom can take only certain distinct energies $\mathrm{E}_1, \mathrm{E}_2, \mathrm{E}_3$, etc. These allowed states of constant energy are called the stationary states of atom.
An atom in a stationary state does not emit electromagnetic radiation as long as it stays in the same state.
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.
Explanation
The postulate that contradicts quantum mechanics is
Option A
“The electron in a H atom’s stationary state moves in a circle around the nucleus.”
In quantum mechanics an electron in a stationary state is described by a delocalized wave‐function (an orbital), not by a definite circular orbit.
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