For the ground state, the electron in th H- atom has an angular momentum = h , according to the simple Bohr model. Angular momentum is a vector and hence there will be infinitely many orbits with the vector pointing in all possible direction . In actuality this is not true.

Question

$\begin{array}{1 1} \text{Because Bohr model gives incorrect values of angular momentum} \\ \text{Because only one of these would have a minimum energy } \\ \text{Angular momentum must be in the direction of spin of electron} \\ \text{Because electron go around only in horizontal orbits} \end{array} $