MCQ
The oxidation number of $Pt$ in ${[Pt({C_2}{H_4})\,C{l_3}]^ - }$ is
- A$+1$
- ✓$+2$
- C$+3$
- D$+4$
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${H_2}(g)\, + \,{I_2}(g)\, \rightleftharpoons \,2HI(g)$ is
(outermost) : [Atomic number of $\mathrm{Eu}=63$ ]
$(i)$ $[Cr(NO_3)_3(NH_3)_3]$
$(ii)$ $K_3[Co(C_2O_4)_3]$
$(iii)$ $K_3 [CoCl_2(C_2O_4)_2]$
$(iv)$ $[Co BrCl(en)_2]$