1.

Which of the following sets of quantum numbers is not allowed                                                [Orissa JEE 1997]

A.                 \[n=1,\,l=0,\,m=0,\,s=+\frac{1}{2}\]
B.                 \[n=1,\,l=1,\,m=0,\,s=-\frac{1}{2}\]
C.                 \[n=2,\,l=1,\,m=1,\,s=+\frac{1}{2}\]
D.                 \[n=2,\,l=1,\,m=0,\,s=-\frac{1}{2}\]  
Answer» C.                 \[n=2,\,l=1,\,m=1,\,s=+\frac{1}{2}\]


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