- AFor limiting line of lyman series $n_1 = 1$ and $n_2 = 10$
- ✓Wavelength for second line of balmer serie $ = \frac{{16}}{{32}}$
- CMaximum frequency for paschen series $(v) = RC$
- DFor first line of bracket series $n_1 = 5$ and $n_2 = 6$
$\frac{1}{\lambda}=\mathrm{R}_{\mathrm{H}} \cdot \mathrm{Z}^{2}\left(\frac{1}{\mathrm{n}_{1}^{2}}-\frac{1}{\mathrm{n}_{2}^{2}}\right)$
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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$Fe ^{2+}( aq )+ S ^{2-}( aq ) \rightleftharpoons FeS ( s )$
When equal volumes of $0.06 M Fe ^{2+}( aq )$ and $0.2 M S ^{2-}( aq )$ solutions are mixed, the equilibrium concentration of $Fe ^{2+}$ (aq) is found to be $Y \times 10^{-17} M$. The value of $Y$ is. . . . .
