Complex of composition, has a spin-only magnetic moment of . It reacts with and shows geometrical isomerism. The IUPAC nomenclature of is
Tetraaquadichloridochromium(III) chloride dihydrate
The explanation for the correct option:
(B) Here spin only magnetic moment .
So, ( that means should be less than )
So,
Or,
Hence,
For unpaired electrons, the oxidation state of should be
can be attained if the complex has a structure that looks like: has the IUPAC name: Tetraaquadichloridochromium(III) chloride dehydrate.
In the ionosphere zone, there is a chloride anion that's why it reacts with silver nitrate to form precipitation.
The explanation for the incorrect options:
In Hexaaquachromium(IV) chloride and Tetraaquadichlorido chromium(IV) chloride dihydrate, in both cases, chromium is in an oxidation state.
In Hexaaqua chromium(III) chloride, there is an absence of unpaired electrons.
Hence, option (B) is correct.