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JEE Main202229 Jul 2022Evening ShiftChemistryStructure of AtomActual

Given below are the quantum numbers for 4 electrons. A. n = 3 , l = 2 , m 1 = 1 , m s = + 1 2 B. n = 4 , l = 1 , m 1 = 0 , m s = + 1 2 C. n = 4 , l = 2 , m 1 = - 2 , m s = - 1 2 D. n = 3 , l = 1 , m 1 = - 1 , m s = + 1 2 The correct order of increasing energy is

Options

  1. AD < B < A < C
  2. BD < A < B < C
  3. CB < D < A < C
  4. DB < D < C < A

Correct answer

B. D < A < B < C

Step-by-step solution

Energy order of sub-shell decided by n + l value. Greater the n + l value of a sub-shell greater is its energy. If two sub-shells have same n + l values the orbital with greater principal quantum number has greater energy A ⇒ 3   d ⇒ n + l = 3 + 2 = 5 B ⇒ 4 p ⇒ n + l = 4 + 1 = 5 C ⇒ 4   d ⇒ n + l = 4 + 2 = 6 D ⇒ 3 s ⇒ n + l = 3 + 0 = 3 D < A < B < C

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