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Structure of Atom question

2021 · 18 Mar · Shift 2 · Q9
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Structure of Atom question

2021 · 18 Mar · Shift 2 · Q9

JEE MainChemistryStructure of AtomMCQ+4 / −1
Given below are two statements : Statement I : Bohr's theory accounts for the stability and line spectrum of Li+Li^+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 :
  1. A
    Statement I is false but statement II is true.
  2. B
    Both statement I and statement II are true.
  3. C
    Statement I is true but statement II is false.
  4. D
    Both statement I and statement II are false.
View written solutionFree

Correct answer: A

  1. Analyze Statement I

    Bohr’s model is applicable to hydrogen-like (one-electron) species such as:

    • HHH
    • He+He^+He+
    • Li2+Li^{2+}Li2+
    • Be3+Be^{3+}Be3+

    Now, Li+Li^+Li+ has atomic number Z=3Z=3Z=3.

    Number of electrons in Li+Li^+Li+: 3−1=23 - 1 = 23−1=2

    So, Li+Li^+Li+ is not a one-electron species; it has two electrons.

    Therefore, Bohr’s theory cannot correctly account for the stability and line spectrum of Li+Li^+Li+.

    Hence, Statement I is false.

  2. Analyze Statement II

    Statement II says that Bohr’s theory was unable to explain the splitting of spectral lines in the presence of a magnetic field.

    Splitting of spectral lines in a magnetic field is called the Zeeman effect.

    Bohr’s theory could explain only the basic line spectrum of hydrogen-like atoms, but it could not explain:

    • Zeeman effect (magnetic field)
    • Stark effect (electric field)
    • fine structure of spectral lines

    Therefore, Statement II is true.

  3. Choose the correct option

    • Statement I: False
    • Statement II: True

    So, the correct option is: A\boxed{A}A​

  4. Comparison with stored answer

    Stored correct answer: A

    My derived answer: A

    They match.

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