The chief are of Zn is the sulphide , ZnS. The are is concentrated by  froth floation process
Channel: Doubtnut
Date: 2020-04-19

The chief are of Zn is the sulphide , ZnS. The are is concentrated by  froth floation process and  then heated  in air to convert   Zns   to Zno.  `2ZnS+30_(2)overset(80%)to 2ZnO+ 2SO_(2)` `ZnO+H_(2)SO_(4)overset(100%)to ZnSO_(4)+ H_(2)``2ZnSO_(4)+2H_(2)Ooverset(80%)to 2Zn+ 2H_(2)SO_(4)+O_(2)`The number  of moles  of  ZnS    required   for producing   2 moles of Zn will  be: