Satement-1: Spin quantum number can have two values `+1/2 and -1/2.`
Statement-2: + ve and -ve signs signify the positive and negative wave functions.

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion
B. If both assertion and reason are true but reason is not the correct explanation of the assertion
C. If assertion is true but reason is false
D. If the assertion and reason both are false

Answer

C

Explanation

Assertion is true but reason is false. Spin angular momentum of the electron, a vector quantity, can have two orientations (represented by + and - sign) relative to a chosen axis. These two orientation are distinguished by the spin quantum number `m_s` equals to `+1/2` or `-1/2`.These are called the two spin states of the electron and are normally represented by the two arrows `uarr` (spin up) and `darr` (spin down ) respectively.