In a substance,the number of atoms of $Cr$ and $O$ are $4.8 \times 10^{10}$ and $9.6 \times 10^{10}$ respectively. The empirical formula of the substance is .......
- A$Cr_2O_3$
- B$CrO_2$
- C$Cr_2O_4$
- DNone of these
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