Editor
Oxidation number of Cr in $\rm{K_{2}Cr_{2}O_{7}}$ and $\rm{K_{2}Cr_{2}O_{4}}$ is
Difficulty: Easy
A: 
$+5,+2$
B: 
$+7,+3$
C: 
$+6,+3$
D: 
$+6,+4$
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