CGPET 2018 Solved Paper

As the electron is present in 5 th orbit in s -subshell and value of l for s -subshell =0
Values of magnetic quantum number (ms) for s -subshell can be calculated as follows:
ms=−1......0+.......+l
l=1,ms=−1,0,+1........ so on.
Hence, value of magnetic quantum number of the electron in s -subshell is also zero.
Hence, (b) is the correct option.