Question

The answer to each question of this set is a single digit integer, ranging from 0 to 9:

Orbital angular momentum of 3s orbitals will be ....

Answer 1

l$=\sqrt{l(l+1))}\times \frac{h}{2\pi }$
For 3s orbital l value is o.
So l$=\sqrt{0(0+1))}\times \frac{h}{2\pi }=0$
Hence answer is 0.