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Coordination Compounds question

2002 · Q106
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Coordination Compounds question

2002 · Q106

NEETChemistryCoordination CompoundsMCQ+4 / −1
Atomic number of Cr and Fe are respectively 24 and 26, which of the following is paramagetic with the spin of electron?
  1. A
    [Cr(CO)6]
  2. B
    [Fe(CO)5]
  3. C
    [Fe(CN)6]4−-−
  4. D
    [Cr(NH3)6]3+
View written solutionFree

Correct answer: D

Atoms, ions or molecules containing unpaired electrons are paramagnetic.

In [Cr(NH3)6]3+

Cr+3= [Ar]3d34s0

NH3 is weak field ligand so pairing of d-electrons take place odes not happen.

AIPMT 2002 Chemistry - Coordination Compounds Question 42 English Explanation 1


Here, Number of unpaired electrons = 3

So it is paramagnetic.

In other cases pairing of d-electrons take place in presence of strong field ligands such as CO or CN–.
AIPMT 2002 Chemistry - Coordination Compounds Question 42 English Explanation 2

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