Q. 225.0( 1 Vote )

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Answer :

a) Theatomic number of Iron (Fe) is Z = 26


The electronic configuration of 26Fe= [Ar] 3d6 4s2


Oxidation number of Fe in [Fe(CN)6]4- is


Let oxidation number of Fe is x


x + (-1) × 6 = -4


x-6 = -4


x = -4 +6


x = 2


Thus, the electronic configuration of Fe2+=[Ar] 3d6


The formation of [Fe(CN)6]4- may be explained through hybridization as follows:



Hybridization: d2sp3


Magnetic character: Diamagnetic (no unpaired electrons)


Spin: Low spin (inner d-orbitals are used for the pairing)


b) The geometrical isomers of the complex [Pt(en)2Cl2]2+ which is optically inactive is given below



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