Question

Assertion :$\left[Fe\right(H_{2}O{)}_6{]}^{3+}$ is strongly paramagnetic whereas $\left[Fe\right(CN{)}_6{]}^{3-}$ is weakly paramagnetic. Reason: $H_{2}O$ is a week field ligand and $C{N}^{-}$ is a strong field ligand.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

$\left[Fe\right(CN{)}_6{]}^{3-}\Rightarrow$C\bar N\Rightarrow$ Strong field ligand.

$F{e}^{3+}=\left[Ar\right]3d^5$(Refer o image 01)

1. 1 unpaired electrons.

2. Weakly paramagnetic

$\left[Fe\right(H_{2}O{)}_6{]}^{3+}\Rightarrow H_{2}O\Rightarrow$ Weak field ligand.

$\Rightarrow F{e}^{3+}\Rightarrow \left[Ar\right]3d^5$ (Refer o image 02)

5 unpaired electrons.

$\left[Fe\right(H_{2}O{)}_6{]}^{2+}$=Strong paramagnetic.