Purple of Cassius is

Match list I (Colloidal system ) with list II (Example) {:("Column-I","Column-II"),((A)"Emulsifier",(p)"Colloidal solution"),((B)"Xerogel",(q)"Soaps "),((C )"Colloidal electrolyte",(r)"Foil of cellophane"),((D)"Purple of Cassius",(s)"Dextrin"),(,(t)"Gold sol"):}

Transparent glassy solid strongly reducing, purple of cassius reduces and gives chromyl chloride test. B is

Transparent glassy solid strongly reducing, purple of cassius reduces and gives chromyl chloride test. A is

Transparent glassy solid strongly reducing, purple of cassius reduces and gives chromyl chloride test. C is