A electron of hydrogen atom on an excited state is having energy $E _n=-0.85 eV$. The maximum number of allowed transitions to lower energy level is
$E _n=-\frac{13.6}{n^{2}}=-0.85$
$\Rightarrow n=4$
No of transition
$=\frac{n(n-1)}{2}=\frac{4(4-1)}{2}=6$
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