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Q.

The chief ore of Zn is the sulphide, ZnS. The ore is concentrated by froth floatation process and then heated in air to convert ZnS to ZnO.

(i) 2ZnS+ 3O2 →80% 2ZnO + 2SO2

(ii) ZnO+ H2SO4 →100% ZnSO4 + H2O

(iii) 2ZnSO4 + 2H2O →80% 2Zn + 2H2SO4+O2

The number of moles of ZnS required for producing 2 moles of Zn will be

 

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a

2

b

2.125

c

3.125

d

4

answer is A.

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Detailed Solution

2 moles of ZnS = 2 ZnO=2ZnSO4= 2Zn 

I mole of ZnS = 1 mol of Zn 

Moles of ZnS = 20.8×0.8×1=3.125 mole 

Since reaction (i), (ii) and (iii) are 80%, 100% and 80% respectively

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