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

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Because Bohr model gives incorrect values of angular momentum

Because only one of these would have a minimum energy

Angular momentum must be in the direction of spin of electron

Because electrons go around only in horizontal orbits

answer is A.

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Detailed Solution

But we know that the angular momentum is a vector quantity. So it is true that according to the Bohr’s model, infinitely many angular momentum vectors of magnitude $h$ are possible, which point in every possible direction.
Since the Bohr’s model is unable to fix the direction of the angular momentum vector of the electron, this means that it gives incorrect values of the angular momentum.

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