When zinc is heated in presence of air strongly, it burns forming a white smoke which settles down to soft wooly flocks of zinc oxide called philosopher's wool or pompholyx.

Commercial preparationog ZnO is obtained by burning Zn-vapours in air. ZnO is collected as white wooly flocks and hence is called as philosopher's wool.

Properties: It is a white amorphous powder which becomes sulpur-yellow on heating but again white on cooling. It is insoluble in water. It is an amphoteric oxide since, it dissolves radily in acids forming the zinc salt and in alkalies forming zincates.

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can u help me to find the oxidation state of metal in the complexes of type [Pt(NH3)6] [PtCl4],

i.e. complexes in which both the cation and the anion is complex?