The oxidation number of $C r$ is $+ 6$ in :

F e {C r}_{2} O_{4}

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K C r O_{3} C l

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C r O_{5}

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{[C r {(O H)}_{4}]}^{⊖}

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Solution

The correct options are
B $K C r O_{3} C l$
C $C r O_{5}$
a. ${F e}^{+ 2} {({C r}_{2} O_{4})}^{2 -} :$ Oxidation state of $C r = + 3$
b. $K^{\oplus} {[C r O_{3} C l]}^{⊖} :$ Oxidation state of $C r = + 6$
c. $C r O_{5}$ : Oxidation state of $C r = + 6$ (Two peroxo linkage)
d. ${[C r {(O H)}_{4}]}^{⊖} :$ Oxidation state of $C r = + 3$
Hence, options B and C are correct.

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