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Question

Chemistry Question on coordination compounds

[Fe(H2O)6]3+[Fe(H_{2}O ) _{6}]^{3+} is strongly paramagnetic whereas [Fe(CN)6]3[Fe(CN)_{6}]^{3-} is weakly paramagnetic. H2OH_{2}O is a weak field ligand and CNCN^{-} is a strong field ligand.

A

If both assertion and reason are true and reason is the correct explanation of assertion

B

If both assertion and reason are true but reason is not the correct explanation of assertion

C

If assertion is true but reason is false.

D

If both assertion and reason are false.

Answer

If both assertion and reason are true and reason is the correct explanation of assertion

Explanation

Solution

[Fe(CN)6]3C Nˉ\left[ Fe ( CN )_{6}\right]^{3-} \Rightarrow C \ \bar {N} \Rightarrow Strong field ligand. Fe3+=[Ar]3d5(Fe ^{3+}=[\text{Ar}] 3 d ^{5}( Refer oo image o1) 1. 1 unpaired electrons. 2. Weakly paramagnetic [Fe(H2O)6]3+H2O\left[ Fe \left( H _{2} O \right)_{6}\right]^{3+} \Rightarrow H _{2} O \Rightarrow Weak field ligand. Fe3+[Ar]3d5\Rightarrow Fe ^{3+} \Rightarrow[ Ar ] 3 d ^{5} (Refer o image o2) 5 unpaired electrons. [Fe(H2O)6]2+=\left[ Fe \left( H _{2} O \right)_{6}\right]^{2+}= Strong paramagnetic.