Statement I: Bohr's theory accounts for stability and line spectrum of Li+ ion. Statement II: Bohr's theory was unable…
Structure of Atom · Class 11 · JEE Main Previous Year Question
Statement I: Bohr's theory accounts for stability and line spectrum of ion. Statement II: Bohr's theory was unable to explain the splitting of spectral lines in the presence of a magnetic field.
Choose the most appropriate answer from the options given below:
- a✓
Both Statement I and Statement II are true.
- b
Statement I is false but Statement II is true.
- c
Both Statement I and Statement II are false.
- d
Statement I is true but Statement II is false.
Both Statement I and Statement II are true.
🧠 The "One-Electron" Filter Bohr's model is famously exclusive. It works flawlessly for any species with exactly one electron (Hydrogenic), but fails the moment a second electron introduces repulsion.
🗺️ The Statement Analysis
- Statement I: (and likely intended here despite the typo in some versions) is a 1-electron system (). Bohr's theory correctly maps its energy levels and line spectrum. (TRUE)
- Statement II: Bohr's model treats the atom as a flat, 2D solar system. It has no explanation for why spectral lines split into multiples when placed in a magnetic field (the Zeeman Effect). (TRUE)
⚡ The Zeeman/Stark Wall Bohr's inability to explain "splitting" (magnetic = Zeeman, electric = Stark) was the major signal that the model needed to be replaced by full quantum mechanics.
⚠️ Common Traps Be careful with the electron count. has 2 electrons and Bohr does not work for it. However, in the context of this JEE question, it is generally treated as an application to hydrogen-like species ().
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