Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : The spin only magnetic moment value for [Fe(CN)6]3– is 1.74 BM, whereas for [Fe(H2O)

Question

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : The spin only magnetic moment value for [Fe(CN)6]3– is 1.74 BM, whereas for [Fe(H2O)6]3+ is 5.92 BM. Reason R : In both complexes, Fe is present in +3 oxidation state. In the light of the above statements, choose the correct answer from the options given below :

(A) Both A and R are true and R is the correct explanation of A
(B) Both A and R are true but R is NOT the correct explanation of A
(C) A is true but R is false
(D) A is false but R is true

Prashant Kotian · Accepted Answer

In [Fe(H2O)6]+3 , H2O is a weak field ligand so configuration of Fe+3 is 1,1,1 g 2t , 1,1 g e so number of unpaired electron are 5 and magenetic momentum is 5.92 BM In [Fe(CN)6]–3 , CN– is a strong field ligand so configuration of Fe+3 is 1, , g 2t , ,0 g e so number of unpaired electron are 1 and magenetic momentum is 1.73 BM

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