Verified Solution • 2025–26 Session moderate

QJEEM19Chfc79: JEE Main 2019 Chemistry - Class 11 JEEM19Chfc79 Solution: The quantum number of four electrons are given below : n = 4, l …

The quantum number of four electrons are given below :
n = 4, l = 2, ml =–2, ms = –1/2
n = 3, l = 2, ml = 1, ms = +1/2
n = 4, l = 1, ml = 0, ms = +1/2
n = 3, l = 1, ml = 1, ms = –1/2
The correct order of their increasing enegies will be :

Multiple Choice Options

  • A IV < II < III < I
  • B I < III < II < IV
  • C IV < III < II < I
  • D I < II < III < IV

Step-by-Step Verified Solution

n = 4, l = 2,   4d orbital, n + l = 6

n = 3, l = 2,   3d orbital, n + l = 5

n = 4, l = 1,   4p orbital, n + l = 5

n = 3, l = 1,   3p orbital, n + l = 4

more is n + l value, more is energy

∴ 3p < 3d < 4p < 4d

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