Solved: CHEMISTRY Question for NEET

NEET CHEMISTRYEasy

Incorrect set of quantum numbers from the following is:

n=4, l=3, m_l = -3, -2, -1, 0, +1, +2, +3, m_s = -1/2

n=5, l=2, m_l = -2, -1, +1, +2, m_s = +1/2

n=4, l=2, m_l = -2, -1, 0, +1, +2, m_s = -1/2

n=5, l=3, m_l = -3, -2, -1, 0, +1, +2, +3, m_s = +1/2

According to the rules for quantum numbers described in the NCERT text:

Principal Quantum Number ( $n$ ): Can be any positive integer.
Azimuthal Quantum Number ( $l$ ): Can have values from $0$ to $n-1$ .
Magnetic Quantum Number ( $m_l$ ): For a given value of $l$ , $m_l$ can have $(2l + 1)$ values ranging from $-l$ to $+l$ , including zero.

Let's evaluate the options:

Option A: For $n=4, l=3$ (f-subshell), permitted $m_l$ values are $-3, -2, -1, 0, +1, +2, +3$ . This set is correct.
Option B: For $n=5, l=2$ (d-subshell), permitted $m_l$ values are $-2, -1, 0, +1, +2$ . The option lists $-2, -1, +1, +2$ but is missing 0. Therefore, this set is incorrect.
Option C: For $n=4, l=2$ (d-subshell), permitted $m_l$ values are $-2, -1, 0, +1, +2$ . This set is correct.
Option D: For $n=5, l=3$ (f-subshell), permitted $m_l$ values are $-3, -2, -1, 0, +1, +2, +3$ . This set is correct.

Thus, Option B is the incorrect set.

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