Q. 45

Note: In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

Assertion: [Fe(CN)6]3– ion shows magnetic moment corresponding to twounpaired electrons.

Reason: Because it has d2sp3 type hybridisation.

A. Assertion and reason both are true, the reason is the correct explanation of assertion.

B. Assertion and reason both are true, but the reason is not the correct explanation of assertion.

C. The assertion is true, the reason is false.

D. The assertion is false the reason is true.

Answer :

The assertion is false butthe reason is true.


For [Fe(CN)6]4– the central metal atom is Fe and its oxidation state is x=-6 times(-1)-4=+2.


Hence, it has a d6 configuration (1s2 2s2 2p6 3s2 3p6 3d6) and as it is left with 2 empty 3d orbitals and 1 empty 4s orbital which in interaction with 3,4p orbitals and attain the hybridisation d2sp3 and the 6 CN- electrons will occupy these 6 hybridised orbitals. And the hybridisation scheme will be:1.PNG


And the orbital energy level diagram is:



which clearly shows that it has no unpaired electrons as CN- is strong field ligand and the energy gap becomes larger, therefore [Fe(CN)6]4– ion is diamagnetic and therefore shows no magnetic because of the absence of unpaired electrons.

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