Complex X of composition $C r {(H_{2} O)}_{6} C l_{n}$ has a spin only magnetic moment of 3.83 BM. It reacts with $A g N O_{3}$ and shows geometrical isomerism. The IUPAC name of X is:

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Tetraaquadichlorido chromium (III) chloride dihydrate

Tetraaquadichlorido chromium (IV) chloride dihydrate

Hexaaqua chromium (III) chloride

Dichloridotetraaqua chromium (IV) chloride dihydrate

answer is D.

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Detailed Solution

$μ = \sqrt{n (n + 2)} B . M = 3.83 B . M . n = 3 (n = N o . o f u n p a i r e d e^{-})$
Therefore, oxidation number of Cr should be+3.
Hence complex is $C r {(H_{2} O)}_{6} C l_{3}$
Complex shows geometrical isomerism, therefore formula of complex is $[C r {(H_{2} O)}_{4} C l_{2}] C l .2 H_{2} O$
IUPAC Name : Tetraaquadichlorido chromium (III) chloride dihydrate