Assertion (A) `[Fe(CN)_(6)]^(3-)` ion shows magnetic moment corresponding to two unpaired electrons.
Reason (R) Because it has `d^(2)sp^(3)` type hybridisation.

Options

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

Answer

D

Explanation

Assertion is false but reason is true.
According to VBT, MOEC of `Fe^(3+)` in `[Fe(CN)_(6)]^(3-)` is

Hybridisation `= d^(2) sp^(3)`
`n=1`
Hence, correct assertion is
`[Fe(CN)_(6)]^(3-)` ion shows magnetic moment corresponding to one unpaired electron.
t.e., `mu=sqrt(n(n+2))`
`=sqrt(1(1+2))`
`=sqrt(3)=1.73 BM`