The chief ore of `Zn` is the sulphide `ZnS.` The are is concentrated by froth floatation
Channel: Doubtnut
Date: 03/05/2020

The chief ore of `Zn` is the sulphide `ZnS.` The are is concentrated by froth floatation process and then heated in air to convert `ZnS` to `ZnO`. `2ZnS+3O_3 80% rarr 2ZnO+2SO.` ZnO+H_2SO_4 100% rarr Zn SO_4+H_2O and 2ZnSO_4+2H_2O 80% rarr 2Zn+2Hn+2H_2SO_4+O_2`. The number of moles of `ZnS` required for producing 2 moles of `Zn` will be :