What will be the orbital  angular  momentum of an electron  in 2s-orbital?

The orbital angular momentum of an electron in 2s orbital is:

$\mathrm{L} =\sqrt{\mathrm{l}(\mathrm{l}+1)} \frac{\mathrm{h}}{2\mathrm{\pi }}$

        =0(0+1)​2πh​

        =0.