A) \[{{\operatorname{VCl}}_{3}}\]
B) \[{{\operatorname{VOSO}}_{4}}\]
C) \[{{\operatorname{Na}}_{3}}V{{0}_{4}}\]
D) \[\left[ v{{\left( {{H}_{2}}O \right)}_{6}} S{{O}_{4}} \right].{{H}_{2}}O\]
Correct Answer: C
Solution :
\[{{\operatorname{Na}}_{3}}V{{O}_{4}}\] \[{{\operatorname{Na}}_{3}}V{{O}_{4}}\]contains vanadium in +5 oxidation state which has vacant d - orbitals and is thus colourless. Most stable oxidation state of this group is +5. In this state, compounds are diamagnetic and colourless except \[{{V}_{2}}{{O}_{5}}\] which is red orange. \[\operatorname{In}\,\,VC{{l}_{3}}\left[ O.S\,\,is+4 \right]\]
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