JEE Mains · Chemistry · STD 12 - 4. d and f- block elements
The incorrect relationship in the following pairs in relation to ionisation enthalpies is _______.
- A \(\mathrm{Mn}^{+} \lt \mathrm{Cr}^{+}\)
- B \(\mathrm{Mn}^{+} \lt \mathrm{Mn}^{2+}\)
- C \(\mathrm{Fe}^{2+} \lt \mathrm{Fe}^{3+}\)
- D \(\mathrm{Mn}^{2+} \lt \mathrm{Fe}^{2+}\)
Answer & Solution
Correct Answer
(D) \(\mathrm{Mn}^{2+} \lt \mathrm{Fe}^{2+}\)
Step-by-step Solution
Detailed explanation
\(\mathrm{Mn}^{2+}:[\mathrm{Ar}] 3 \mathrm{~d}^5\) Half filled stability More 1 E than \(\mathrm{Fe}^{2+}\) \(\mathrm{Fe}^{2+}:[\mathrm{Ar}] 3 \mathrm{~d}^6\)
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