MCQ
The most stable oxidation state of $Cr$ in aq. medium is
- A$Cr^{2+}$
- ✓$Cr^{3+}$
- C$Cr^{4+}$
- D$Cr^{6+}$
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(At. nos. $Mn = 25, Fe = 26, Co = 27, Ni = 28$)
