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JEE Main20254 Apr 2025Evening ShiftChemistryd and f Block ElementsActual

The incorrect relationship in the following pairs in relation to ionisation enthalpies is :

Options

  1. AMn ⁺ Cr ⁺
  2. BMn ⁺ Mn ²⁺
  3. CFe ²⁺ Fe ³⁺
  4. DMn ²⁺ Fe ²⁺

Correct answer

D. Mn ²⁺ Fe ²⁺

Step-by-step solution

Mn ²⁺:[ Ar ] 3 ~d ^5 Half filled stability More 1 E than Fe ²⁺ Fe ²⁺:[ Ar ] 3 ~d ^6

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