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Assertion : The spectrum of $\mathrm{He}^{+}$is expected to be similar to that of hydrogen.Reason : $\mathrm{He}^{+}$is also one electron system.
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If both assertion and reason are true and reason is the correct explanation of assertion
All species like $\mathrm{He}^{+}, \mathrm{Li}^{2+}, \mathrm{Be}^{3+}$ having one electron are expected to have similar spectrum as that of hydrogen.
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