MCQ
Amongst given elements, $+4$ oxidation state is known in aqueous medium for?
- ✓$Ce$
- B$Eu$
- C$Yb$
- D$Tl$
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$(i)$ $[Cr(NO_3)_3(NH_3)_3]$
$(ii)$ $K_3[Co(C_2O_4)_3]$
$(iii)$ $K_3 [CoCl_2(C_2O_4)_2]$
$(iv)$ $[Co BrCl(en)_2]$

