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Chief ore of Zn is ZnS. The ore is conce...

Chief ore of `Zn` is `ZnS`. The ore is concentrated by froth flotation process and then heated in air to convert `ZnS` to `ZnO`. ltntgt `2 ZnS + 3O_(2) rarr 2 ZnO + 2 SO_(2)`…(i)
`ZnO`, thus formed is treated with dilute `H_(2) SO_(4)`.
`ZnO + H_(2) SO_(4) rarr ZnSO_(4) + H_(2) O` ....(ii)
On electrolysis of `ZnSO_(4(aq)), Zn` metal is produced.
`2 ZnSO_(4) + H_(2) O rarr 2 Zn + 2H_(2) SO_(4) + O_(2)`....(iii)
`ZnO` on dissolution in `NaOH` gives

A

1.16

B

2.32

C

4.64

D

9.28

Text Solution

Verified by Experts

The correct Answer is:
C
1 mol ZnS gives 1 mol of `ZnO`
`97 kg ZnS` gives `1` mol of `ZnO`
`225 kg ZnS -= (81)/(97) xx 225 kg ZnS = 187.88 kg ZnO`
=`(187.88)/(81) kg ZnO`
=`2.3195` k mol of `ZnO`
1 mol of `ZnO` dissolves in `2 mol` of `NaOH`
`2.3195` k mol of `ZnO` dissolves in
`2 xx 2.3195` k mol of `NaOH = 4.64` k mol of `NaOH`.
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