NEET 2023 Phase 2 · ChemistryPrevious Year Question

The incorrect set of quantum numbers from the following is:

Answer: (D) $n = 5$ , $l = 2$ , $m_{l} = - 2, - 1, + 1, + 2$ , $m_{s} = + \frac{1}{2}$ . \textbf{Answer:} (D) $n = 5$ , $l = 2$ , $m_{l} = - 2, - 1, + 1, + 2$ , $m_{s} = + \frac{1}{2}$ \textbf{Solution:} For $l = 2$ , $m_{l}$ must range over $- 2, - 1, 0, + 1, + 2$ (5 values, including $0$ ).

A. $n = 4$ , $l = 2$ , $m_{l} = - 2, - 1, 0, + 1, + 2$ , $m_{s} = - \frac{1}{2}$
B. $n = 5$ , $l = 3$ , $m_{l} = - 3, - 2, - 1, 0, + 1, + 2, + 3$ , $m_{s} = + \frac{1}{2}$
C. $n = 4$ , $l = 3$ , $m_{l} = - 3, - 2, - 1, 0, + 1, + 2, + 3$ , $m_{s} = - \frac{1}{2}$
D. $n = 5$ , $l = 2$ , $m_{l} = - 2, - 1, + 1, + 2$ , $m_{s} = + \frac{1}{2}$ ✓

Correct Answer

(D) $n = 5$ , $l = 2$ , $m_{l} = - 2, - 1, + 1, + 2$ , $m_{s} = + \frac{1}{2}$

Solution & Explanation

\textbf{Answer:} (D) $n = 5$ , $l = 2$ , $m_{l} = - 2, - 1, + 1, + 2$ , $m_{s} = + \frac{1}{2}$ \textbf{Solution:} For $l = 2$ , $m_{l}$ must range over $- 2, - 1, 0, + 1, + 2$ (5 values, including $0$ ). Option (D) omits $m_{l} = 0$ , making it an incomplete and hence incorrect set of quantum numbers.

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