MEDIUMMCQ SINGLEJEE Mains ChemistryInorganic ChemistryCoordination compoundsPrevious Year Questions
Assertion: K4[Fe(CN)6] is diamagnetic and [Fe(H2O)6]Cl3 is paramagnetic. Reason: Hybridisation of central metal in K4[Fe(CN)6] is sp3d2, while in [Fe(H2O)6]Cl3 is d 2sp 3. [AIIMS 2009]
A.Both Assertion and Reason are true and Reason is
B.Both Assertion and Reason are true but Reason is
C.Assertion is true but Reason is false.✓ Correct
D.Both Assertion and Reason are false..
Explanation
In K4[Fe(CN)6], and Fe is present as Fe+2 Fe+2=[Ar]3d64s0 Since all the electrons are paired Hence, its diamagnetic in nature. In [Fe(H2O)6]Cl3 Fe is present as Fe+3 Fe+3 = [Ar]3d54s0 Since, it contains five unpaired electrons Hence, it is paramagnetic in nature. So, the assertion is true. For K4[Fe(CN)6], since CN is a strong field ligand, the unpaired electrons will get paired up. Thus the hybridization of Fe will be d 2sp
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