(a) Write the formula of the following coordination compound : Iron(III) hexacyanoferrate (II)

(b) What type of isomerism is exhibited by the complex


(c) Write the hybridisation and number of unpaired electrons in the complex [CoF6 ]3- . (Atomic No. of Co = 27)


(a) The molecular formula for coordination compound Iron(III) hexacyanoferrate(II)

Fe4[ Fe (CN )6]3


(b) [Co(NH3)5 Cl]SO4 will show ionisation isomerism, and the possible isomers are


[Co(NH3)5Cl]SO4 and [Co(NH3)5 SO4] Cl


(c) Electronic configuration of Co3+ ions is sp3d3 hybridized orbitals of Co3+, with six pairs of electrons from six F- ions.


Hybridisation = sp 3d 3


Number of unpaired electron = 4


There are 4 unpaired electron in [CoF6]3+


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