Question

Match List-I with List-II:

List-I	List-II
(A) Principal Quantum Number (n)	(ii) 1, 2, 3,...
(B) Azimuthal Quantum Number (l)	(iv) 0, 1, 2,... n - 1
(C) Magnetic Quantum Number (ml)	(iii) 0, ± 1, ± 2, ± 3,..., ± 1
(D) Spin Quantum Number (s)	(i) -1/2, +1/2

Choose the correct answer from the options given below:

• (A) - (ii), (B) - (iv), (C) - (iii), (D) - (i).
• (A) - (ii), (B) - (iii), (C) - (iv), (D) - (i).
• (A) - (iv), (B) - (ii), (C) - (iii), (D) - (i).
• (A) - (iv), (B) - (ii), (C) - (i), (D) - (iii).

Hint:

To remember the quantum numbers, just think about how each of them is defined and which value it takes. Principle quantum numbers range from 1 to infinity, azimuthal quantum numbers range from 0 to n-1, magnetic quantum numbers range from -l to +l, and spin quantum numbers are always either +1/2 or -1/2.

Answer 1

The Correct Option is A

Quantum numbers define properties of atomic orbitals:
• Principal quantum number (n): Denotes the main energy level (1, 2, 3...).
• Azimuthal quantum number (l): Specifies the orbital shape (0 to n-1).
• Magnetic quantum number (ml): Determines the orbital's spatial orientation (-l to +l).
• Spin quantum number (s): Describes electron spin (+1/2 or -1/2).
Therefore the correct matching is: (A) - (ii), (B) - (iv), (C) - (iii), (D) - (i)