AIPMT PRELIMS2011Chemistry-Coordination Compounds
AIPMT PRELIMS 2011 Chemistry Magnetic Properties MCQ Question
Type: MCQ-conceptual-Medium-Class 12
The d-electron configurations of Cr²⁺, Mn²⁺, Fe²⁺ and Co²⁺ are d⁴, d⁵, d⁶ and d⁷ respectively. Which one of the following will exhibit minimum paramagnetic behaviour?
A
[Cr(H₂O)₆]²⁺
B
[Mn(H₂O)₆]²⁺
C
[Fe(H₂O)₆]²⁺
D
[Co(H₂O)₆]²⁺
Correct Answer
Option D
Detailed Explanation
Co²⁺ has the electron configuration 3d⁷ 4s⁰, which results in the minimum number of unpaired electrons, making it the least paramagnetic.
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