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(i) I = Lyman series, II = Balmer series, III = Paschen series.
(ii) Since $\lambda=\frac{h c}{\Delta E }$; For maximum wavelength, $\Delta E$ should be minimum. It is for III line. So its wavelength will be maximum.
(ii) Since $\lambda=\frac{h c}{\Delta E }$; For maximum wavelength, $\Delta E$ should be minimum. It is for III line. So its wavelength will be maximum.
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