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NCERT Class XII Chemistry
Chapter - The d- and f-Block Elements
Questions with Solutions

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Question : 24
Total: 49
Calculate the number of unpaired electrons in the following gaseous ions : Mn‌3+, Cr‌3+, V‌3+ and Ti‌3+. Which one of these is the most stable in aqueous solution ?
Solution:  
Mn3+– 3d44s0‌ 4 unpaired electrons
Cr3+– 3d34s0‌3 unpaired electrons
V3+– 3d24s0‌‌2 unpaired electrons
Ti3+– 3d14s0‌1 unpaired electrons
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