MCQ
Which of the following statements concern with transition metals ?
- Acompounds containing ions of transition elements are usually coloured
- Bthe most common oxidation state is $+3$
- Cthey easily form complexes
- ✓All of the above
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$[Co(en)_3]\,[Cr(C_2O_4)_3]$
$[Cu(NH_3)_4]\, [CuCl_4]$
$[Ni(en)_3]\,[Co(NO_2)_6]$