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Complex X of composition Cr(H2O)6Cln has a spin only magnetic moment of 3.83 BM. It reacts with AgNO3 and shows geometrical isomerism. The IUPAC nomenclature of X is : (1) Tetraaquadichlorido chromium (III) chloride dihydrate (2) Hexaaqua chromium (III) chloride (3) Dichloridotetraaqua chromium (IV) chloride dihydrate (4) Tetraaquadichlorido chromium(IV) chloride dihydrate

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Answer is (1)

Cr(H2O)6 Cln if magnetic mement is 3.83 BM then it contain three unpaired electrons. It means chromium in +3 oxidation state so molecular formula is Cr(H2O)6 Cl3 

 This formula have following isomers 

(a) [Cr(H2O)6]Cl3 : react with AgNO3 but does not show geometrical isomerism. 

(b) [Cr(H2O)5Cl]Cl2.H2O react with AgNO3 but does not show geometrical isomerism. 

(c) [Cr(H2O)4Cl2]Cl.2H2O react with AgNO3 & show geometrical isomerism. 

(d) [Cr(H2O)3Cl3].3H2O does not react with AgNO3 & show geometrical isomerism. 

[Cr(H2O)4Cl2]Cl.2H2O react with AgNO3 & show geometrical isomerism and it's IUPAC nomenclature is Tetraaquadichlorido chromium (III) Chloride dihydrate.

Answer is (1)



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