Precipitate Mn(OH)₂ is added with few drops of conc. Nitric acid followed by a compound to get purple colour. How many of the following compounds gives this reaction.
${\mathrm{Na}}_3{\mathrm{BiO}}_4, {\mathrm{PbO}}_2,{\mathrm{Pb}}_3{\mathrm{O}}_4,\mathrm{SnO},{\mathrm{Bi}}_2{\mathrm{O}}_3,{\mathrm{NaIO}}_4,{\left({\mathrm{NH}}_4\right)}_2{\mathrm{S}}_2{\mathrm{O}}_8$