Purple of cassius is colloidal solution of :
(a) Silver
(b) Lead
(c) Gold
(d) Mercury
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mercury of cassius is colloidal solution
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Purple of Cassius. Purple of Cassius is a purple pigment formed by the reaction of gold salts with tin(II) chloride. ... The tin(II) chloride reduces the chloroauric acid from the dissolution of gold in aqua regia to a colloid of elemental gold supported on tin dioxide to give a purple precipitate or coloration.
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