MCQ
Which of the following is not an element
- AGraphite
- BDiamond
- ✓$22-$ carat gold
- DRhombic sulphur
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$(i)$ $[Cr(NO_3)_3(NH_3)_3]$
$(ii)$ $K_3[Co(C_2O_4)_3]$
$(iii)$ $K_3 [CoCl_2(C_2O_4)_2]$
$(iv)$ $[Co BrCl(en)_2]$

$E _{ FeO _4^{2-} / Fe ^{2+}}^\theta$ is $x \times 10^{-3} V$. The value of $x$ is $.........$.
