$KMnO_4$, purple

$K_2MnO_4$, dark green

$MnO_2$, brown

$MnO$, colorless

${\rm{A}}{{\rm{l}}_2}{{\rm{O}}_3}$ and ${\rm{CaC}}{{\rm{O}}_3}$

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

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

PbS and MgO

0%

25%

50%

75%

It is prepared by heating mercury in chlorine

It reduces stannic chloride

It oxidizes stannous chloride

It sublimes readily

${\rm{Na}}\left[ {{\rm{AuCl}}} \right]$

${\rm{Na}}\left[ {{\rm{AuC}}{{\rm{l}}_2}} \right]$

${\rm{Na}}\left[ {{\rm{AuC}}{{\rm{l}}_3}} \right]$

${\rm{Na}}\left[ {{\rm{AuC}}{{\rm{l}}_4}} \right]$

Zinc oxide

Mercuric oxide

Aluminium oxide

Ferric oxide

Tin

Zinc

Mercury

Calcium

By mixing up mercuric thiocyanate and gum

By adding Nessler’s reagent to a ammonium salt solution

By pouring little mercury into ${\rm{AgN}}{{\rm{O}}_3}$ solution

By heating mercuric chloride

${\rm{AgCl}}$

${\rm{A}}{{\rm{g}}_2}{\rm{S}}$

${\rm{AgI}}$

${\rm{AgBr}}$

${\rm{Cu}}{\left( {{\rm{N}}{{\rm{O}}_3}} \right)_2}$

${\rm{AgN}}{{\rm{O}}_3}$

${\rm{NaN}}{{\rm{O}}_3}$

${\rm{Pb}}{\left( {{\rm{N}}{{\rm{O}}_3}} \right)_2}$

2.5⎯4.5%C

0.5⎯1.5%C

0.12⎯0.25%C

1⎯2%C