A) \[{{[Mn{{O}_{4}}]}^{-}}\]
B) \[{{[Cr{{(CN)}_{6}}]}^{3-}}\]
C) \[C{{r}_{2}}{{O}_{3}}\]
D) \[Cr{{O}_{2}}C{{l}_{2}}\]
Correct Answer: A
Solution :
\[Cr{{O}_{2}}C{{l}_{2}}\] Let O. No. of \[Cr=x\] \[\therefore \]\[x+2(-2)+2(-1)=0\] \[x-4-2=0\] \[\therefore \]\[x=+6\]
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