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NEET Chemistry QUESTION #7385
Question 1
The four orbitals 4d, 5p, 5f, and 6p, arranged in order of decreasing energy, give the correct sequence:
  • 5f > 6p > 5p > 4d✔️
  • 6p > 5f > 5p > 4d
  • 6p > 5f > 4d > 5p
  • 5f > 6p > 4d > 5p
Correct Answer Explanation
Using \((n + \ell)\) rule:
  • 5f: \(n+\ell = 5+3 = 8\)
  • 6p: \(n+\ell = 6+1 = 7\)
  • 5p: \(n+\ell = 5+1 = 6\)
  • 4d: \(n+\ell = 4+2 = 6\), but lower \(n\) so lower energy than 5p
Decreasing energy order: 5f > 6p > 5p > 4d