Assertion : `[Fe(CN)_6]^(3-)` is weakly paramagnetic while `[Fe(CN)_6]^(4-)`is diamagnetic.
Reason : `[Fe(CN)_6]^(3-)` has +3 oxidation state while `[Fe(CN)_6]^(4-)` has `+2` oxidation state.

Options

A. If both (A) and (R) are correct and (R) is the correct explanation of (A).
B. If both (A) and (R) are correct, but (R) is not the correct explanation of (A).
C. If (A) is correct, but(R) is incorrect.
D. If both (A) and (R) are.incorrect.

Answer

B

Explanation

`[Fe(CN)_6]^(3-)` possesses unpaired electron to show paramagnetic nature while `[Fe(CN)_6]^(4-)`possesses no unpaired electron and thus shows diamagnetic nature.