MCQ
Which among the following metals crystallise as a simple cube?
- ✓Polonium
- BIron
- CCopper
- DGold
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$(I)$ $CrO_4^{2-}$
$(II)$ $MnO_4^-$
$(III)$ $Cr_2O_7^{2-}$ ?
Which one is not formed in product?