1.

The oxidation number of Cr is +6 in

Answer»

`FeCr_(2)O_4`
`KCrO_3Cl`
`CrO_3`
`[Cr(OH_4)]^(-)`

Solution :Consider the oxidation state of.Cr. as .X.
B) `KCrO_(3)Cl implies 1 + x +3 (-2)+(-1)=0`
`1 +x -6 -1=0 implies x =6`
c) ` CrO_5 rarr`
`CrO_(5)=Cr(O)(O)_4`
`implies x +(-2) +4(-1)=0`
`implies x-2 -4 =0 implies x -6 =0 implies x +6`


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