The chief ore of Zn is the sulphide , Zn...

The chief ore 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:

A

`3.125`

B

`2`

C

`2.125`

D

`4`

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