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

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry2. structure of atom1 Mark
MCQ
Correct statement regarding to $H-$ spectrum is
  • A
    For limiting line of lyman series $n_1 = 1$ and $n_2 = 10$
  • ✓
    Wavelength for second line of balmer serie $ = \frac{{16}}{{32}}$
  • C
    Maximum frequency for paschen series $(v) = RC$
  • D
    For first line of bracket series $n_1 = 5$ and $n_2 = 6$
✓

Answer

Correct option: B.
Wavelength for second line of balmer serie $ = \frac{{16}}{{32}}$
b
For limiting line of Lyman series $n_{1}=1$ and $n_{2}=\infty$

$\frac{1}{\lambda}=\mathrm{R}_{\mathrm{H}} \cdot \mathrm{Z}^{2}\left(\frac{1}{\mathrm{n}_{1}^{2}}-\frac{1}{\mathrm{n}_{2}^{2}}\right)$

For second line of Balmer series, $\mathrm{n}_{1}=2$ and $\mathrm{n}_{2}=4$

$\frac{1}{\lambda}=\mathrm{R}\left(\frac{1}{4}-\frac{1}{16}\right) \quad \mathrm{v}=\frac{\mathrm{C}}{\lambda}$

For minimum frequency of Paschen series $\mathrm{n}_{1}=3, \mathrm{n}_{2}=\infty$

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