AIPMT PRELIMS2007Chemistry-Coordination Compounds
AIPMT PRELIMS 2007 Chemistry Magnetic Properties MCQ Question
Type: MCQ-conceptual-Medium-Class 12
The d electron configurations of Cr2+, Mn2+, Fe2+ and Ni2+ are 3d4, 3d5, 3d6 and 3d8 respectively. Which one of the following aqua complexes will exhibit the minimum paramagnetic behaviour?
A
[Fe(H2O)6]2+
B
[Ni(H2O)6]2+
C
[Cr(H2O)6]2+
D
[Mn(H2O)6]2+
Correct Answer
Option B
Detailed Explanation
Paramagnetism is due to the presence of unpaired electrons. The fewer the unpaired electrons, the weaker the paramagnetic behavior. Ni²⁺ has the least number of unpaired electrons.
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