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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)
What mass of `Zn` will be obtained from an ore containing `225 kg` of `ZnS` ? `(Zn = 65, S = 32, O = 16, H = 1)`.

A

102 kg

B

151 kg

C

112 kg

D

134 kg

Text Solution

Verified by Experts

The correct Answer is:
B
`225 xx 10^(3) of ZnS = (225 xx 10^(3))/(97)`
=`2.32 xx 10^(3) mol ZnS`
=`2.32 xx 10^(3) mol of Zn`
=`2.32 xx 10^(3) xx 65 of Zn`
=`150.8 Kg Zn ~~ 151 Kg Zn`.
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