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JEE Main 2025 Apr 2 Shift 2, Chemistry Q7: Quantum Numbers

JEE Main2025Apr 2, Shift 2Chemistry
Q.

Which of the following statements are true ?

(A) The subsidiary quantum number describes the shape of the orbital occupied by the electron.

(B)

is the boundary surface diagram of the orbital.

(C) The + and - signs in the wave function of the orbital refer to charge.

(D) The wave function of orbital is zero everywhere in the xy plane.

  1. A

    (B) and (D) only

  2. B

    (A), (B) and (C) only

  3. C

    (C) and (D) only

  4. D

    (A) and (B) only

Solution

(A) Correct. The subsidiary (azimuthal) quantum number determines the shape of an orbital ( spherical, dumb-bell, etc.).

(B) Correct. A dumb-bell oriented along the x-axis with two lobes on either side of the nucleus is precisely the standard representation of the orbital.

(C) Incorrect. The + and - signs label the phase of the wave function ; they have nothing to do with electric charge.

(D) Incorrect. vanishes in the plane (the nodal plane perpendicular to x), not in the plane.

Only (A) and (B) are true.

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