Question

Which of the following statement is incorrect about Bohr's model of atom?

• A. It fails to account for the finer details of the hydrogen atom spectrum.
• B. Unable to explain the splitting of spectral lines in the presence of magnetic field.
• C. The angular momentum of electron is quantised.
• D. The ability of atoms to form molecule by chemical bonds.
• E. Unable to explain the splitting of spectral lines in the presence of magnetic field.

Hint:

Bohr's model is effective in explaining the hydrogen atom spectrum, but it fails to explain phenomena like fine structure and Zeeman effect, which require quantum mechanical models.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
The question requires us to identify the incorrect statement regarding the features and limitations of Niels Bohr's atomic model.
Bohr's theory effectively explained the discrete energy levels of a hydrogen atom but had several significant shortcomings.
Step 2: Key Formula or Approach:
The approach is to evaluate each statement against the known postulates and recognized limitations of Bohr's atomic theory.
No mathematical formula is needed; conceptual verification is sufficient.
Step 3: Detailed Explanation:
Let's analyze the options individually.
Option (A): Bohr's model could not explain the finer details (such as doublets) of the hydrogen spectrum observed with advanced spectroscopes. This statement is true.
Option (B) and (E): The model failed to explain the Zeeman effect, which is the splitting of spectral lines in a magnetic field. This statement is true.
Option (C): A primary postulate of Bohr's model is that the angular momentum of an electron is quantized (\(mvr = \frac{nh}{2\pi}\)). This statement is true.
Option (D): The statement implies Bohr's model explains "The ability of atoms to form molecule by chemical bonds." This is entirely false.
Bohr's model provided no insight into chemical bonding, molecular formation, or the shapes of molecules.
Step 4: Final Answer:
The statement claiming the model explains the ability of atoms to form molecules by chemical bonds is incorrect.