An element $A$ in a compound ABD has oxidation number ${A^{n - }}$. It is oxidized by ${\rm{C}}{{\rm{r}}_2}{\rm{O}}_7^{2 - }$ in acidic medium. In the experiment $1.68 \times {10^{ - 3}}$ mole of ${{\rm{K}}_2}{\rm{C}}{{\rm{r}}_2}{{\rm{O}}_7}$ were used for $3.26 \times {10^{ - 3}}$ mole of $ABD$. The new oxidation number of $A$ after oxidation is :Failed to load question data. Please try again later.
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