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[" In chromite ore,the oxidation number ...

[" In chromite ore,the oxidation number of iron and chromium "],[" are respectively....."(-feCr_(2)O_(n))],[[" (a) "+3,+2," [KCET 2010] "],[" (c) "+2,+6," (b) "+3,+6],[" (d) "+2,+3]]

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