(D) The electron spin quantum number $(m_s)$ describes the intrinsic angular momentum of an electron.While it is often visualized as the electron spin

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Two quantum mechanical spin states which have no classical analogue.

(D) The electron spin quantum number $(m_s)$ describes the intrinsic angular momentum of an electron.While it is often visualized as the electron spinning about its axis,this is a quantum mechanical property.These two values,$+\frac{1}{2}$ and $-\frac{1}{2}$,represent two distinct quantum mechanical spin states that do not have a direct classical analogue.

Class 11 Chemistry Data Entry - Chemistry Level 0 of all question bank

The quantum numbers $+1/2$ and $-1/2$ for the electron spin represent:

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A
Rotation of the electron in clockwise and anticlockwise direction respectively.
B
Rotation of the electron in anticlockwise and clockwise direction respectively.
C
Magnetic moment of the electron pointing up and down respectively.
D
Two quantum mechanical spin states which have no classical analogue.