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Chemistry Question on coordination compounds

Which one of the following shows maximum paramagnetic character?

A

[Fe(CN)6]3−\left[ Fe ( CN )_{6}\right]^{3-}

B

[Fe(CN)6]4−\left[ Fe ( CN )_{6}\right]^{4-}

C

[Cr(H2O)6]3+\left[ Cr \left( H _{2} O \right)_{6}\right]^{3+}

D

[Cu(H2O)6]2+\left[ Cu \left( H _{2} O \right)_{6}\right]^{2+}

Answer

[Cr(H2O)6]3+\left[ Cr \left( H _{2} O \right)_{6}\right]^{3+}

Explanation

Solution

Due to strong ligand i.ei . e. cyanide ion, 3d3 d electrons pair up. undefined so only one unpaired electron. Due to strong ligand CN,e−CN , e ^{-} pair up ∴\therefore No unpaired electron As H2OH _{2} O is weak ligand, no pairity of electron takes place. ∴\therefore Three unpaired electrons. only one unpaired electron.