${\rm{C}}{{\rm{r}}_2}{{\rm{O}}_3}$

${\rm{Cr}}{{\rm{O}}_2}{\rm{C}}{{\rm{l}}_2}$

${\rm{CrC}}{{\rm{l}}_3}$

${{\rm{K}}_2}{\rm{S}}{{\rm{O}}_4}.{\rm{C}}{{\rm{r}}_2}{\left( {{\rm{S}}{{\rm{O}}_4}} \right)_3}.24{{\rm{H}}_2}{\rm{O}}$

Yellow

White

Brown

Black

${\rm{Fe}}{{\rm{C}}_2}$

${\rm{F}}{{\rm{e}}_3}{\rm{C}}$

${\rm{Fe}}{{\rm{C}}_3}$

${\rm{F}}{{\rm{e}}_2}{\rm{C}}$

${\rm{A}}{{\rm{g}}^ + }$

${\rm{C}}{{\rm{u}}^{2 + }}$

${\rm{F}}{{\rm{e}}^{2 + }}$

${\rm{N}}{{\rm{a}}^ + }$

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

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

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

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

Fused mixture of ${\rm{A}}{{\rm{g}}_2}{\rm{S}}$ and KCl is electrolysed

${\rm{A}}{{\rm{g}}_2}{\rm{S}}$ is reduced with CO

${\rm{A}}{{\rm{g}}_2}{\rm{S}}$ is roasted to ${\rm{A}}{{\rm{g}}_2}{\rm{O}}$ which is reduced with C

Treating with NaCN solution followed by metal displacement with zinc

Titanox

Lithopone

White pigment

None of these

${\rm{S}}{{\rm{O}}_3}$

${\rm{S}}{{\rm{O}}_2}$

${\rm{F}}{{\rm{e}}_2}{{\rm{O}}_3}$

All of these

$La{\left( {OH} \right)_3}$

$Eu{\left( {OH} \right)_3}$

$Er{\left( {OH} \right)_3}$

$Lu{\left( {OH} \right)_3}$

F, Cl, Br, I

Na, K, Rb, Cs

Li, Be, B, C

Fe, Co, Ni, Cu

${\rm{BaZn}}{{\rm{O}}_2}$

${\rm{Ba}} + {\rm{Zn}}{{\rm{O}}_2}$

${\rm{BaCd}}{{\rm{O}}_2}$

${\rm{Ba}}{{\rm{O}}_2} + {\rm{Zn}}$