${\rm{Fe}}{\left( {{\rm{CO}}} \right)_5}$ reacts with ${\rm{B}}{{\rm{r}}_2}{\rm{C}}{{\rm{l}}_4}$

Carbonyl complexes are usually formed with transition metals

All transition metals form mono metallic carbonyls

The decomposition of ${\rm{Ni}}{\left( {{\rm{CO}}} \right)_4}$ to give Ni is used in the extraction of Ni by Mond’s process

${\rm{\mu }} = n{\left( {n + 2} \right)^2}$

${\rm{\mu }} = {n^2}\left( {n + 2} \right)$

${\rm{\mu }} = \frac{n}{{\left( {n + 2} \right)}}$

${\rm{\mu }} = \sqrt {n\left( {n + 2} \right)}$

F, Cl, Br, I

Na, K, Rb, Cs

Li, Be, B, C

Fe, Co, Ni, Cu

${{\rm{K}}_2}{\rm{C}}{{\rm{r}}_2}{{\rm{O}}_7}$

${\left( {{\rm{N}}{{\rm{H}}_4}} \right)_2}\left[ {{\rm{TiC}}{{\rm{l}}_6}} \right]$

${\rm{VOS}}{{\rm{O}}_4}$

${{\rm{K}}_3}\left[ {{\rm{Cu}}{{\left( {{\rm{CN}}} \right)}_4}} \right]$

Three series

Six series

Two series

Four series

Pt

Fe

W

Cu

$KMnO_4$, purple

$K_2MnO_4$, dark green

$MnO_2$, brown

$MnO$, colorless

${\rm{H}}{{\rm{g}}_2}{\rm{C}}{{\rm{l}}_2}$

${\rm{BaS}}{{\rm{O}}_4}$

${\rm{HgC}}{{\rm{l}}_2}$

${\rm{NaHC}}{{\rm{O}}_3}$

Be

Fe

Mo

Cr

Yb$^{3+}$

Tm$^{3+}$

Er$^{3+}$

None of these

Ce⁴⁺, Yb²⁺

Gd³⁺, Tb⁴⁺

Eu²⁺, Lu³⁺

Ce⁴⁺, Eu²⁺