Dichromate ion is treated with base,the oxidation number of $Cr$ in the product formed is .... .
- A$3$
- B$4$
- C$5$
- D$6$
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| $A$. $Cr_2O_7^{2-}$ | $1$. $+3$ |
| $B$. $MnO_4^{-}$ | $2$. $+4$ |
| $C$. $VO_3^{-}$ | $3$. $+5$ |
| $D$. $FeF_6^{3-}$ | $4$. $+6$ |
| $5$. $+7$ |
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