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2. structure of atom — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry2. structure of atom1 Mark
MCQ
Given below are two statements.

Statement $I:$ According to Bohr's model of an atom, qualitatively the magnitude of velocity of electron increases with decrease in positive charges on the nucleus as there is no strong hold on the electron by the nucleus.

Statement $II:$ According to Bohr's model of an atom, qualitatively the magnitude of velocity of electron increases with decrease in principal quantum number.

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 false
  • B
    Both Statement $I$ and Statement $II$ are true
  • ✓
    Statement $I$ is false but Statement $II$ is true
  • D
    Statement $I$ is true but Statement $II$ is false
✓

Answer

Correct option: C.
Statement $I$ is false but Statement $II$ is true
c
Velocity of electron in Bohr's atom is given by

$\mathrm{V} \propto \frac{\mathrm{Z}}{\mathrm{n}}$

$Z=$ atomic number of atom, corresponds to $+v e$ charge so as $Z$ increase velocity increases so statement$-I$ is wrong.

and as $'n'$ decreases velocity increases so statement$-II$ is correct.

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