Question

Given below are two statements : Statement I : Bohr's theory accounts for the stability and line spectrum of Li⁺ ion. Statement II : Bohr's theory was unable to explain the splitting of spectral lines in the presence of a magnetic field. In the light of the above statements, choose the most appropriate answer from the options given below :

• A. Both statement I and statement II are true.
• B. Both statement I and statement II are false.
• C. Statement I is true but statement II is false.
• D. Statement I is false but statement II is true.

Hint:

Always check the number of electrons for Bohr's model. If it's not exactly 1 electron, the model fails.

Answer 1

The Correct Option is D

Step 1: Evaluate Statement I. Bohr's theory is applicable only to single-electron species (H, \(He^+\), \(Li^{2+}\), \(Be^{3+}\)). \(Li^+\) has 2 electrons, so Bohr's theory cannot explain its stability or spectrum. (Statement I is False).
Step 2: Evaluate Statement II. Bohr's theory could not explain the Zeeman effect (splitting in magnetic fields) or the Stark effect (splitting in electric fields). (Statement II is True).